Solar System: Earth: Moon: Phases

NASA's Dr. Marc of The Space Place answers questions about Moon phases and the lunar month. Includes GIF animation of the Moon going through its phases.

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.

Mechanical watch that displays the phase of the Moon, accurate to one day in 1000 years.

A 100 by 100 pixel GIF image of the current Moon phase on a black background, from the United States Naval Observatory. Accessible as a URL for embedding in web pages.

Article identifying the exact date and time of van Gogh's Moonrise painting, based on Moon phase calculations.

Describes how astronomers used phase of Moon calculations and ancient Greek religous festivals to date the original Marathon run.

NASA Moon images with captions showing different phases, suitable for printing and classroom display.