Earth Hour 2008
Phillip Chee
Each part represents a few minutes before the end of each of the three types of twilight. Civil twilight ends when the sun is 6° below the horizon; Nautical twilight ends when the sun is 12° below the horizon; Astronomical twilight ends when the sun is 18° below the horizon.
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The previous 4 images in the loop
The next 4 images in the loop
