Solar System: Earth: Moon: Phases

From the atomic clock at the United States Naval Observatory.

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.

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

Information and Perl script to calculate moon phases including phase illumination age distances angular diameter new/full moon calculation

NASA Goddard Spaceflight Center (GSFC) Five Millennia Catalog of the phases of the Moon.

Describes a slide rule Moon phase calendar accurate over 8000 years into the past or future, and provides other methods of computing astronomical information.

Displays the phase of the Moon in a browser window, with times of last and next Full Moon and New Moon.

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.

Pictures, animations, and brief comments.

Shows the Moon in eight positions around the Earth to shade in the dark area and the unobservable side.