Rise And Set iP User`s Manual
Contents
1. Here amp Now Calc As Shown Track On TrackOff Button Location re Starting from the top and left side of the view the first item is the TRACK ON button This button is used to turn the Latitude Longitude tracking button on or off ddd mm ss Degrees Minutes Seconds Location To the immediate right of the TRACK ON button are three letter groups standing for degrees ddd minutes mm and seconds ss These mark columns indicating degrees minutes and seconds of either Latitude or Longitude Latitude Row Location Just below the TRACK on TRACK ON button is the Latitude row 000 This row contains several controls A button for indicating if the latitude is north or south And COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 9 of 25 three edit boxes to allow you to enter the degrees minutes and seconds of a latitude or view the current latitude as degrees minutes and seconds Latitude Row Location Below the Latitude row is the Longitude row o00 H oo Ff oo containing similar controls for the the Longitude The east west button degrees minutes and seconds edit fields are grouped exactly as the Latitude row is grouped Astronomical Year Information Row Location Continuing downward the next control is the Astronomical Year Information Row containing a CE BCE button and a grouping of three edit fields for the year month and day of interest SS poof oo Astronomi2. W Once you activate one of the cardinal point switches the others will disappear This also activates the Compass Rose as a switch to cancel the find search When you click on the Compass Rose you will hear a click and see the Compass Rose flash followed by the phrase OKAY and the cardinal points will reappear From left to right there are four widgets 1 North South hemisphere indicator 2 Degrees text field 3 Minutes text field 4 Seconds text field To enter a latitude you must know at least three of these 4 items North South hemisphere indicator is required Degrees is required Minutes is required Seconds is desired but not required as you may always enter a value of zero 000 There are 90 degrees of latitude Starting at zero degrees latitude at the equator and increasing to 90 degrees of latitude at the North Pole or the South Pole Southerly latitudes are considered arbitrarily to be negative and northerly latitudes are considered to be positive 66 33 39 is the Arctic Circle and 66 33 39 is the Antarctic Circle Since positive and negative carry connotations of goodness and non goodness instead of the plus or minus sign the suffix N or S is often used So 66 33 39 N is the Arctic Circle and 66 33 39 S is the Antarctic Circle When entering a hemisphere indicator in Rise And Set iP the North and South button is used as a prefix instead of suffixing N or S For longitude W or E is prefi
3. local rise set times for days in the future in case you are going to do some viewing next weekend or 1 ZULU does not refer to a geographical region of Africa in this case but to the Military timezone reference to the zero reference line of UTC Lookup Military Timezones on Wikipedia for more information COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 13 of 25 next year from the same location If you want to find out the rise set times for some place on the planet other than where you are outside of one minute of latitude or one minute of longitude then the times displayed will be ZULU time GMT Rise And Set Information Row Location Click the information button to get the following view Title ndustry Rise And Set iP will speak the version number when you select the above page This is so you don t have to glance at the phone So if you are doing some observing and you accidently hit the info button you will hear a version number to let you know you just hit the wrong button COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 14 of 25 How To Use Rise And Set iP Rise And Set iP was designed with two basic criteria in mind 1 All controls must be usable from a single view 2 Be useful to the amateur visual astronomer The color choice is a night time visual choice rather than a Halloween choice Orange text on black backgrounds whenever possible
4. of the year it won t matter since the twilight will be either DARK or BRIGHT and rise and set become less frequent occurrences How Atmospheric Refraction Affects The Accuracy The atmosphere is dirty Dust ash a plethora of pollutants meteor dust and more contribute to the refraction of light in the atmosphere The closer you look toward the horizon the more pollutants you are looking through The closer to the zenith you look the fewer pollutants you have to look through Unfortunately rise and set times involve looking toward horizons In general the more clear the atmosphere the more accurate the prediction of Rise And Set iP will be Most of the refraction effects are taken into account in the 4 minutes of accuracy quoted above COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 24 of 25 Acknowledgments Most of the formulae used in Rise And Set iP comes from code developed in 1970s before even the Apple was conceived The original code was cobbled together from celestial mechanics textbooks and NASA white papers until several books came onto the scene The first author that needs acknowledgment is Jean Meeus The second is Peter Duffet smith These two authors have several books that any amateur astronomer would covet These books are available through several sources although not in electronic form very disappointing The books by both authors are numerous and are be available from the followi
5. Rise And Set IP User s Manual version 2011 10 29 by software Industry amp General Hardware S 1 G H This manual may not be reproduced by any means mechanical nor electrical nor by any means conceived of in the future without the express permission of Software Industry amp General Hardware COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 1 of 25 COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 2 of 25 Table of Contents NEVA deif EE 5 Klee T Finding Your Way Around The Rise And Set iP View 9 Track Om Trackon BUOM Bee EE 9 ddd mm ss Degrees Minutes Seconds Locaton 9 kaude ROW Beer e WEE 9 Latt de ROW LOCATON DEE 10 Astronomical Year Information ROW Location 10 Astronomical Year Information Header ROW Locaton 10 Compas S ROSE OG OM EE 10 Here amp Now Calc As Shown Location 10 Time Rise And Set Information ROW Location 10 RSE SOLU OCA O EE 11 SEE COMME OCA Le WEE 11 Sunrise Sunset ROW Locaton 11 Moonrise MOONSET ROW LOCATION D 11 Civil Twilight Row Information Localo nsss E 12 Nautical Twilight Row Information Location 12 Astronomical Twilight Row Information Locaton 12 Day Night Length Row Information Location 12 SUN OF VOOM AIWAYS VISIDI EE 12 SUMP OF MOORMNGVER E e UE 13 Twilight Hours Always Dark 13 IN Wie el MOUS AlIWAYS BQ IN EE 13 OMT VS ICIS Eocale dn EE 13 Rise And Set Information ROW Location 14 HOW TO U
6. SE RISE ANG SEU EE 15 rIOW USE hee lee EE 15 How to Use The Here amp NOW button 15 HOW touse INE compass OSC E 16 How To Cancel Searching For Cardinal Homts 18 ROW TO Ener a Lait e E 18 WIV Leg a PEAN EE 20 WAY E ele e EE ZU Why Use the Here amp NOW BURON EEN 20 Why Use the Compasso EE 20 How To Enter A NOT VISIBLE Latitude Exvampie 21 How To Enter A ALWAYS VISIBLE Latitude Evample 22 How To Enter An ALWAYS BRIGHT Twilight Exame 22 COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 3 of 25 PAC GUN Le 23 letzte PONE P ACKAGS ACCUPACY EE 23 How The FPP Affects The Time Calculations ACCUracCN 24 How The FPP Affects The Positional ACGcuracy 24 How Latitude Affects The e lee 24 How Atmospheric Refraction Affects The ACCUracy 24 eene SOLOING EE 20 COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 4 of 25 Rise And Set iP What You Have Rise And Set iP is an iPhone application intended for use by Amateur Astronomers especially Visual Astronomers Rise And Set IP will Assist you in finding North South East or West Give you your current Latitude and Longitude Allow you to track to a location within about 4m Calculate the o Sunrise Sunset o Moonrise Moonset o Civil Nautical and Astronomical Twilight start and end times o Number of daylight hours and number of night time hours Calculate the above for any latitude longitude pair of an ast
7. UR time to waste Test Advertisement D EE Example of entering a negative latitude value Rise And Set iP will detect the negative sign and will strip the negative sign off and replace it with a positive value At the same time the North South value will change to South Here is an example of the result eat Averticornent Here amp Now Calc As Shown COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 19 of 25 Why To Use a Feature Why Use Tracking In large telescope fields you may often be given a latitude and longitude to set up at Finding the latitude and longitude is sometimes problematical With Rise And Set iP just turn on tracking and walk until you get to the latitude and longitude you were given Also viewing certain objects is sometimes optimal at a fixed latitude longitude The tracking feature of Rise And Set iP can assist you in finding that latitude longitude location even from a vehicle Don t forget to turn tracking off as the navigation features of the iPhone can drain the battery more quickly than you might realize Why Use the Here amp Now Button The button is used to obtain your current physical latitude and longitude from the navigation feature found in your iPhone Click on the left side of this segmented button Here amp Now and Rise And Set iP will read the values for your current latitude and longitude location and display the results as d
8. about the definitions of Moonrise and Moonset If the date used to calculate the moonrise and moonset results in a New Moon date the word New will prefix the Moon label An example is shown below Why not show the other phase information If you are a visual astronomer you want the best COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 11 of 25 viewing you can get and that is a new moon Other phases just have too much light when the moon is up to be visually excited about the moon phase Civil Twilight Row Information Location From left to right starting with the word C Twilight is the start of civil twilight and the end of civil twilight See the definition of Civil Twilight for the meaning of the words start and end Nautical Twilight Row Information Location From left to right starting with the word N Twilight is the Nautical Twilight Information Row The hh mm represents the time of from left to right Nautical Twilight End Nautical Twilight Start The information button to the right contains information about the definitions of Nautical Twilight Astronomical Twilight Row Information Location From left to right starting with the word A Twilight the values are time values in the form hh mm representing the start and end of Astronomical Twilight For the definition of astronomical twilight see the information button to the right of the astronomical twilight s
9. and W cardinal point letters is actually a button that you Look at the compass rose icon the compass indicated with text for West Each of these primary may click to activate Once you do activate one of the cardinal point buttons the others will disappear from around the compass rose As an example click on the N for North You will now see a compass rose that looks slightly different The other primary cardinal points have vanished Find a flat surface to put your iPhone onto Slowly rotate your iPhone The logic of Rise And Set iP looks for a 2 degrees fit to determine a successful hit on your direction This accuracy is just fine for indicating your direction for your telescope Since the iPhone is compact rotation of the phone even a small amount can produce a relatively large degree change So rotate the phone slowly While you are slowly rotating your iPhone listen carefully make sure your volume is turned up on your iPhone When you hit the direction you are interested in you will hear the direction spoken in English followed by Okay a seemingly universal word that needs NO translation Once again the cardinal points will return to the compass rose so it looks like Without rotating the iPhone any more stand so you are at the Home Button end of your iPhone Look toward the end of the iPhone furthest from you You are now facing the direction you were looking for Use one of the s
10. cal Year Information Header Row Location Below the Astronomical Year Information Row is the Astronomical Year Information Header Row Year Month Day Note the Info button between the words Year and Month Compass Rose Location Below and to the left is the Compass Rose 4 and W are buttons They control what The Compass Rose N E S direction you may want to find The Compass Rose also acts as a cancel search for N E S or NW button in case you want to stop the Here amp Now Calc As Shown Location To the right of the Compass Rose are two selection buttons The Here amp Now button will read he current GPS Latitude and Longitude and the current Date and Time before doing the Rise And Set IP calculations While Calc As Shown will use the values you have entered into the edit fields for latitude longitude and Astronomical Year Time Rise And Set Information Row Location From left to right GMT represents the nature of the hour and minutes GMT means the times shown are based on GMT and no daylight savings is used If instead the letters LCL are shown then the hours and minutes are shown as local time including daylight saving time and timezone offset LCL is always the default as long as you use Here amp Now If you enter a longitude and latitude then if the degrees and minutes are the same as your current COPYRIGHT 2004 2011 So
11. dnight sun and polar night 24 hours of night The same is true in the southern hemisphere but six months out of phase to the northern hemisphere When either the sun or moon are not visible the hh mm values are replaced by the term NOVIS which stands for the english words NOT VISIBLE Twilight Hours Always Dark Since the sun can be hidden from view there are times when the sun never appears high enough to satisfy the definition for civil nautical or astronomical twilight During these times the twilight rise set times will be set to DARK Twilight Hours Always Bright You can be at a latitude that the sun never appears to set These latitudes will never achieve the definition of civil nautical nor astronomical twilight When this condition occurs the hh mm values for twilight will be replaced by BRIGHT GMT vs LCL Locale times If you use the Here amp Now segment of the button you are asking to use the local position In this case the locale chose is your local position and local timezone along with any applicable daylight saving information will be applied The time type left of the word Rise will display LCL If you enter a latitude and longitude that is not within one minute of latitude or longitude of you current position you will be switched to ZULU time GMT will be displayed left of the word Rise This is true regardless of your date setting So you can find
12. e that there is an N E S and W around the outside of the compass rose These are the cardinal points of the compass representing North East South and West respectively The other cardinal points of the compass there are actually 16 cardinal points but we only discuss 8 points are North East South East South West and North West If you touch one of the cardinal points of the compass try touching the N as an example the other cardinal points will disappear leaving on the N and the compass rose Rotate the iPhone slowly very slowly until you hear the cardinal point you were searching for North for instance followed by the words Okay The Compass Rose with all cardinal points will reappear You are now facing the direction you wanted see the How to use the Compass Rose for details How To Enter A NOT VISIBLE Latitude Example Barrow AK is located at 71 16 06 N 156 AO 18 W Barrow will be in a position that the moon will not rise on 2011 October 28 If you enter the values above and press the Calc As Shown segmented button you should see the following display Test Advertisement Here amp Now Calc As Shown COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 21 of 25 How To Enter A ALWAYS VISIBLE Latitude Example Enter the latitude longitude and date values for the How To Enter ANOT VISIBLE Latitude Example above and change the
13. egrees minutes and seconds This feature has a multitude of uses The most common is to set up a computerized interface or to enter a latitude and longitude into computer planetarium software for creating an observation map It is also useful for geo treasure games and for general hiking For visual astronomers it is very handy for comet watching and super nova patrol Noting the latitude and longitude of your observing location for any object that looks unusual in the sky Why Use the Compass Rose The compass rose is there to solve a nasty problem facing many new visual astronomers When you are setting up a telescope you need a particular part of the scope to point toward North or sometimes South or on some telescopes West or East If it is twilight then you may not have Polaris to guide you quite yet If you are in light polluted skies then you may not even be able to find Polaris If you are in the Southern Hemisphere then you bound to the southern cross Still if it is before twilight then you have a rough idea but not a more exact fix Now most modern day computerized scopes will correct for a poor directional alignment but it takes a while and if you want to track something it can be a nightmare unless you align your scope properly to begin with COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 20 of 25 That is what the compass rose will help you to do Look at the compass rose below Not
14. et time Day Night Length Row Information Location From left to right the hh mm represent the length in hours and minutes of the length of daylight and the length of night time The information button to the right describes the definitions for day time and night time Sun Or Moon Always Visible There are some latitudes that cause the sun or moon to either be always visible This condition happens most notably in the northern hemisphere at or above arctic circle region In the southern hemisphere at or below the antarctic circle region The Arctic Circle marks the southern extremity of the polar day 24 hour daylight sometimes referred to as the midnight sun and polar night 24 hours of night The same is true in the southern hemisphere but six months out of phase to the northern hemisphere COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 12 of 25 When either the sun or moon are always visible the hh mm values are replaced by the term AL VS which stands for the english words ALWAYS VISIBLE Sun Or Moon Never Visible There are some latitudes that cause the sun or moon to be always hidden This condition happens most notably in the northern hemisphere at or above the arctic circle In the southern hemisphere at or below the antarctic circle region The Arctic Circle marks the southern extremity of the polar day 24 hour daylight sometimes referred to as the mi
15. ftware Industry amp General Hardware ALL RIGHTS RESERVED 10 of 25 latitude and longitude degrees and minutes LCL will be the default If the degrees and minutes not the same as your current location then GMT is applied instead Rise Column Location Below the Here amp Now Calc As words Rise and Set Each of the be found just below the words The represents from top to bottom moonset civil twilight start and end astronomical twilight start and end hours Shown selection buttons are two words identifies a column that can hh mm for each column sunrise sunset moonrise nautical twilight start and end total daylight hours total night time Set Column Location The hh mm for Moonset Nautical To the Right of the Rise Column Location is the Set Column each column represents from top to bottom Sunset Twilight Start Total night time hours Sunrise Sunset Row Location From left to right starting with the word Sun is the Sun Information Row The hh mm represents the time of from left to right Sunrise and Sunset The information button to the right contains information about the definitions of Sunrise and Sunset Moonrise Moonset Row Location From left to right starting with the word Moon is the Moon Information Row The hh mm represents the time of from left to right Moonrise and Moonset The information button to the right contains information
16. hemisphere to SOUTH Then press the Calc As Shown segmented button You should see the following display Test Advertisement B ce 2011 Here amp Now Calc As Shown How To Enter An ALWAYS BRIGHT Twilight Example Use the same values as the How To Enter AALWAYS VISIBLE Latitude Example Press the Calc As Shown segmented button and notice that the twilight values indicate BRIGHT The reason is that the sun rises at 13 02 in the afternoon and sets at 07 18 the next morning No twilight can happen COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 22 of 25 Accuracy Floating Point Package Accuracy One of the things that will affect your accuracy is the floating point library package used to represent non integer numbers If you are not a computer person nor a mathematician the previous sentence may have made no sense to you Lets do an example to show you what is going on There is a common example shown in most high school math classes that illustrates the point quite well Example A number can have a non terminating decimal value don t panic now this is really very easy For instance 1 divided by 3 is 0 333333 The 3 decimal value never ends It just keeps going on forever Sometimes this non terminating decimal value is indicated by a small bar above the repeating part of the number 0 33333 0 1234123 the top number indicates the value 0 333 33 33 33 the bottom
17. ng publishers Amazon has all of both author s books Willmann Bell Publishing carry all of Jean Meeus books and most of Peter Duffet Smith s books Cambridge Press carry all of Peter Duffet Smith s books COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 25 of 25
18. number indicates 0 1234 123 123 123 Let x takeonthe value 0 9999999 Then 10x 9 99999 99 We now have two equations and 1 unknown variable x If we subtract the two we should be able to solve for the unknown variable 10x x 9 99999 99 0 99999 99 9x 9 yl But x is 0 9999999 not 1 How can this be There is no trick here In a decimal based number system 0 9999999 is also 1 Think of it as a target 0 9999999 Is so close to 1 in a base ten number system that they are identical Computer systems have to represent base ten number systems as base two numbers For integer values this is simple and the value is only limited by the number of base two numbers that can be stored at one time Each of these base two numbers is called a binary digit for historical reasons or more commonly a bit The more bits a computer can use to store a number the bigger the decimal valued integer it can store But what about fractional Real numbers Consider the value 0 1 base ten When you convert this to a base two number system it becomes a non terminating fractional base two number This means it can be difficult to represent something as simple as a dime in a digital computer What is needed is a method of mapping decimal Real numbers into base two Real numbers COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 23 of 25 Real numbers in computer techno babble are called floating point numbers becau
19. ronomical year within J2000 from JD 0 on All of the above can be done from a single view COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 5 of 25 This Page Intentionally Left Blank COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 6 of 25 Notes dd stands for degrees latitude ddd stands for degrees longitude mm stands for minutes of a degree or minutes of an hour ss stands for seconds of a degree or seconds of a minute hh stands for hours of a day Latitude is entered and displayed as degrees minutes and seconds north or south Longitude is entered and displayed as degrees minutes and seconds west or east The symbol stands for degrees of latitude or longitude The symbol stands for minutes of latitude or longitude The symbol stands for seconds of latitude or longitude The term widget is any icon on a screen of any type button text field etceteras The symbol indicates a plus or minus sign AL VS indicates Always Visible NOVIS indicates Not Visible DARK indicates twilight never ends BRIGHT indicates twilight never starts COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 7 of 25 This Page Intentionally Left Blank COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 8 of 25 Finding Your Way Around The Rise And Set iP View
20. se the decimal point can float to any place in the number The magic code that does this for programmers is called the floating point package FPP Some FPPs are more sophisticated than are others The FPP available in the iPhone is adequate for Rise And Set iP How The FPP Affects The Time Calculations Accuracy The point of this is that your accuracy is determined primarily by this FPP package on whatever device you are using The algorithms yield an accuracy of 2 seconds The iPad and iPhone FPP is good enough to give a general accuracy for the time calculations of 2 minutes Add atmospheric refraction and this means that the accuracy of Rise And Set IP is approximately 4 minutes This accuracy is more than adequate for amateur astronomers or others trying to find rise and set times How The FPP Affects The Positional Accuracy GPS positional accuracy is determined by several things How accurate the Department Of Defense is willing to allow your equipment to resolve your position and some settings in the Apple iOS Applications Programmer Interface API You can get within about 4 meters of your indicated latitude longitude when tracking Certainly close enough for setting up weekend after weekend or even year after year How Latitude Affects The Accuracy As you get closer to either pole the accuracy of Rise And Set iP will decrease As far south as 71 S latitude and 71 N are probably the limits of the accuracy For a large part
21. so viewing the text doesn t destroy your night vision Soft colors for both day and night viewing to ease your eye strain Visual astronomy can already be taxing on the eyes bright white lights do not help How to Use Tracking Near the top of the main view you should find a button that looks like this Eege TRACK ON If you click on this button two things will happen 1 The iPhone will continually update your GPS position and display the update in the latitude and longitude display using degrees minutes and seconds 2 The button text will turn to When you are finished tracking just click on the TRACK OFF button to return to a fixed latitude and longitude display No map is displayed This feature is intended to show where you are on a telescope field or observing field It is specifically not a turn by turn feature So the map is superfluous How to Use The Here amp Now button The Here amp Now button is on the left side of the segmented button as shown above To find your current latitude and longitude click on the Here amp Now side of the segmented button and your latitude longitude values will populate the degrees minutes and seconds displays for both latitude and longitude COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 15 of 25 How to use the compass rose The icon has the four primary cardinal points of N for North E for East S for South
22. traight edges of the iPhone as a guide and sight along that edge to guide you in setting up your tripod for your telescope COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 16 of 25 Remember to turn the iPhone slowly If you hear a Nor East South East South West or Nor West you will be able to judge whether you have turned the iPhone too fast Rotate it back toward the direction that you wanted Here is an example of finding North The left image is rotated 15 degrees toward West and the right image is 15 degrees toward East If you are too far East rotate slowly toward the West until you get to North Here amp Now Cale As Shown When you have rotated to the cardinal point you are searching for the iPhone will speak to you by saying the cardinal point in english and then the word Okay If you rotate too far you may hear one of the intermediate cardinal compass points such as Nor East Nor West South East or South West This is an indication you have gone too far Simply reverse the direction This is a handy tool for initially aligning your telescope Once you have done the initial alignment follow the user s manual for your telescope to refine the alignment COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 17 of 25 How To Cancel Searching For Cardinal Points The compass rose image is a switch that is activated when you select N E S or
23. xed You may use a plus or minus sign when you enter a value into the degrees minutes or seconds text fields The value will be corrected to be North or South WEST or EAST and the absolute value of the degrees will be shown instead Entering a negative value for minutes or seconds will result in the plus or minus sign being ignored and removed This does mean that if you are at 00 01 01 S you will have to toggle the hemisphere switch yourself as entering a negative zero is the same as entering a positive zero So 00 01 01 will end up being a north latitude not a south latitude Tap your finger on the degrees text field and the numeric punctuation keyboard will appear on your iPhone screen COPYRIGHT 2004 2011 Software Industry amp General Hardware ALL RIGHTS RESERVED 18 of 25 Use the normal editing keys to enter the value you want to use In our example we are going to use 66 33 39 the Arctic Circle to find the time of sunrise sunset moonrise moonset nautical twilight start and end and the length of the day If there is a number in the text field use the delete key to erase the values and type in the number 66 Then press the Done key The value 66 will appear in the degrees edit field Repeat this procedure for the minutes and seconds edit fields You may try entering punctuation or shifting the keyboard and trying more values but this will only result in warnings and re entering values But it is YO
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