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Circular sunset/sunrise calendar

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POSTED BY: Sander Huisman
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Note that the code will not work for all geolocations; some parts of the world don't have sunsets/sunrise for extended periods of times. For that the code will not work correctly…
POSTED BY: Sander Huisman
POSTED BY: Mark Dowdeswell

Very neat! Thanks for sharing! I use the Trace function to get the non-rounded values for sunset/sunrise. Normally it is rounded to the minute (reflecting the precision you can get because of local elevation, elevation around the horizon where the sun sets, temperature distortions, etc), but it make it very ugly. The Trace is a hack, but the only one that kinda works, I hope it keeps working in future versions… I actually asked for an update to Sunset/Sunrise that would give the precise one, perhaps as an Around value. Future versions might improve on this.

Thanks for the fix!
POSTED BY: Sander Huisman

Fantastic post - thanks!

To make Sander's notebook "standalone", the three lines at the start could be edited to use variable $GeoLocationCity:

    location = $GeoLocationCity; (* set the location*)
    tz = location["TimeZone"][[2]]; (* which timezone *)
    locationname = location[[2, 1]]; (* name of the location for displaying purposes*)
POSTED BY: Mark Dowdeswell

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