Pictures, animations, and brief comments.
From the atomic clock at the United States Naval Observatory.
Describes a slide rule Moon phase calendar accurate over 8000 years into the past or future, and provides other methods of computing astronomical information.
Information and Perl script to calculate moon phases including phase illumination age distances angular diameter new/full moon calculation
Displays the phase of the Moon in a browser window, with times of last and next Full Moon and New Moon.
Xphoon sets the X-Windows root window image to a picture of the Moon in its current phase.
Explains why the Ponzo Illusion makes the Moon appear larger when near the horizon.
The United States Naval Observatory (USNO) Moon phase display for the years 1800 through 2199.
Shows the Moon in eight positions around the Earth to shade in the dark area and the unobservable side.
Twenty-five questions about the Moon's phases and rotation with an answer key, geared to fifth-graders.
Science /
Astronomy /
Calendars_and_Timekeeping
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