Daylight World Map

Shows which parts of the world are in daylight, which are in twilight, and which are in darkness. The position of the sun (projected on to the Earth) is also shown as a yellow circle.

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 a panel on the right-hand side.

It is also possible to choose a "globe" view of the Earth, rather than the default "map" view, using the "View Mode" selector. In either mode, the map can 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 slider labelled "Time Step". In addition, if "globe" view is selected, there is an additional slider to control how quickly the view of the Earth rotates.

The program makes some approximations; do not rely on the results to be totally accurate, they are intended as a guide only. In addition, I believe the globe view in particular may not be a true representation.

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Recent comments

Yin & Yang
I has been thinking that the Yin & Yang cycle created in China was the result of observing the movement of Sun and Moon in Day and Night more than 5,000 years ago. Your simulation had proven my hypothesis.  Well done! Steve

posted 2012-05-29 by Paschal

Request
Wonderful program that I've been using for months now.   Appreciate that you have now added equator, tropics and arctics.   Would it be possible to add the Prime Meridian and International Date Line also?

posted 2012-03-23 by Tom

Cities
In the USA you show Peoria?  But don't show Cleveland, Cincinatti or Columbus?  What kind of app is this?

posted 2010-10-12 by Dave

Cool!
This is quite good i didn't think it would be good coz' i have to do it for homework but it turned out to be facinating.

posted 2009-11-08 by Bethany

re: request
Thanks for your comment. Ideally I would like to have it plot moon and planets too. It may be a little difficult as the current simulation (sun only) repeats every year, whereas of course the moon and planets don't. Also the maths would be more complicated. However I will look into it.

posted 2007-12-12 by Admin

Subject:	Daylight
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