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This Demonstration shows the hours of daylight for a given latitude and the night and daylight halves of the globe for a given date and time.
THINGS TO TRY
Rotate and Zoom in 3D
The hours of daylight are calculated as the center of the sun's disk passes the horizon and its altitude is zero.
Snapshot 1: always 12 hours of daylight at the Equator
Snapshot 2: up to 24 hours of daylight above the Arctic Circle
Snapshot 3: some days, 0 hours of daylight below the Antarctic Circle
The world map is a resized version of the one developed by the NOAA. 
The sunset and sunrise definitions are taken from 
 "Marine Geology & Geophysics."
National Geophysical Data Center
. (Jun 21, 2011).
 Paul Schlyter, "
How to compute rise/set times and altitude above horizon
", Stockholm, Sweden
Mean Solar Time
Wolfram Demonstrations Project
Published: January 23, 2012
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