Twilight application

Twilight calculates twilight from sun and moon. This is useful when planning a voyage and specially when out in the wild, be it climbing, hiking or sailing, where twilight is an important feature, or when planning a voyage. If you are looking at the stars or hunting northern lights, best periods will be when there is complete darkness.

Twilight also calculates best orientation and solar energy for you solar charger ;-)

Twilight is licenced free of charge. So you are free to use and share it with others provided that copies are not made or distributed for commercial advantage.

Installation :

Twilight is written in Java so and should work on any computer. Just extract the zip file to a suitable location and double-clic the twilight*.jar file to make it start. If nothing happens, you may have to type 'java -jar twilight*.jar' from a console. If it still does not start, check that you have the Java Virtual Machine installed. It can be obtained at no cost from the Java (Oracle) website.


Download (87 kB) version beta 0.4


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I wrote Twilight while waiting for the first sun after a long and cold winter on board of a sailboat in the Thule region, in northern Greenland. Enjoy :-)
Peter Gallinelli, March 2016




peter.gallinelli May 2018