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Daylight World Map

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Instructions

Shows which parts of the world are in daylight, which are in twilight, and which are in darkness. The approximate positions of the sun and moon (projected on to the Earth) are also shown.

Various locations around the world can be selected, and the date and time can be changed. For the currently selected location and the current date and time, information such as the number of daylight hours and sunrise/sunset times are shown in an information panel.

The map can also be animated to show the passage of light and shadow across the surface of the Earth over time. The speed can be selected using the "Time Step" control.

The program makes some approximations; do not rely on the results to be totally accurate, they are intended as a guide only.

See Also:
Geek Calendar Tool - Show information on various calendar systems.
Geek Clock Tool - Show various clock systems.

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Recent Update

5 Dec 2015
Daylight World Map V2.59 released - Fixed map type selection bug.

Announcements

Force close errors? The most common cause of the app crashing is the phone running out of memory, especially when zooming in. Some developments are planned to use memory more efficiently to help avoid this problem. In the meantime, if your phone has limited memory, try closing other apps, or is possible avoid zooming in too much!

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Recent comments

i for information The procedure to centre the map at your home by inserting your location is hard to work out. Each individual step to save this under cities should be part of i for information. Especially for people who turn off the battery hungry location service as it is not needed most of the time and seldom works inside anyway. Stil waiting for the moving midnight/date line.
posted 2016-04-19 by John
The app does default to the phone's location if known, so for some users there is no need to set it. If you want it fixed to a certain city, I still think it is fairly easy to do using the location button. I imagine most people won't change this regularly. Showing the date line is quite difficult as the app does not know about time zone regions, only which timezone each city belongs to. And it's made worse as some countries cause the date line to move simply by changing which side they declare themselves to be on (e.g. Samoa)!

Moscow +3 GMT Moscow (Russia) is a +3 GTM, but not +4 GMT!
posted 2016-04-07 by Dmitry Marsov
The recent changes to Russian timezone will need to be incorporated into the phone's OS before this time change will take effect in the app. It should happen automatically following an Android update.

Vertical moving Date/Weekday/midnight line Along with midnight circling the globe so does the change of weekday and date. If you are showing the sun circulating and the moon circulating surely it would be reasonable to show one ciculating vertica line representing midnight and the date change and the weekday change as previously suggested. That would place you one step ahead of others. Good luck. John.
posted 2016-04-03 by J Sherwin

World map option Could your world map have the Pacific Ocean central display option please. (Split Atlantic ocean just west of Iceland between South America and Africa). 6 billion people (India and China) would love you for this option.
posted 2016-02-11 by John
Thanks for the feedback. Actually that has been requested by others too! The map in the main app can be centred on any point, but the widget is currently fixed at zero longitude. I would like add the option to change this when I have some free time, so it may yet appear in a future version!

Suggested useful update A vertical white date line in the centre of the night shadow representing midnight..... The chosen day and date format would either side of the line.... For example 2400 hrs Mon 24th / 0000 hrs Tues 25th (avoiding the path of the moon and sun).... THEN you could allow the world map to centre on the chosen location..... This could even be another app called Terminator Dateline....
posted 2016-02-05 by John

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