Phases

Astronomical calendar
On-line calculator for Moon/Sun Rise/Set, moon phase, sidereal time and Julian day.
http://wise-obs.tau.ac.il/~eran/Wise/wise_calen.html

Correct Time and Moon Phase
From the atomic clock at the United States Naval Observatory.
http://www.obioncounty.com/News/clock.html

How long does each phase of the Moon last?
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.
http://spaceplace.jpl.nasa.gov/en/kids/phonedrmarc/2004_march.shtml

Moon Phases
Information and Perl script to calculate moon phases including phase illumination age distances angular diameter new/full moon calculation
http://search.cpan.org/~brett/Astro-MoonPhase/MoonPhase.pm

Moon Phases 5000 Year Catalog
NASA Goddard Spaceflight Center (GSFC) Five Millennia Catalog of the phases of the Moon.
http://sunearth.gsfc.nasa.gov/eclipse/phase/phasecat.html

Moonstick Information Site
Describes a slide rule Moon phase calendar accurate over 8000 years into the past or future, and provides other methods of computing astronomical information.
http://www.moonstick.com/

Phase of Moon
Displays the phase of the Moon in a browser window, with times of last and next Full Moon and New Moon.
http://www.die.net/moon/

Phase of Moon GIF
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.
http://tycho.usno.navy.mil/cgi-bin/phase.gif

Phases of the Moon and Percent of the Moon Illuminated
Pictures, animations, and brief comments.
http://aa.usno.navy.mil/faq/docs/moon_phases.php

Phases of the Moon Exercise
Shows the Moon in eight positions around the Earth to shade in the dark area and the unobservable side.
http://www.astro.lsa.umich.edu/~fogel/teaching/labs/moon_phases.html

The Space Place Images of Earth's Moon for the Classroom
NASA Moon images with captions showing different phases, suitable for printing and classroom display.
http://spaceplace.jpl.nasa.gov/en/educators/teachers_moon_images.shtml

StarChild Moonlight Madness
NASA's Star Child site page that describes the phases of the Moon. Ends with a test to identify the eight Moon phases and their order.
http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/moonlight.html

The UnMuseum's Ponzo and the Moon
Explains why the Ponzo Illusion makes the Moon appear larger when near the horizon.
http://unmuseum.mus.pa.us/exmoon.htm

Virtual Reality Moon Phase
The United States Naval Observatory (USNO) Moon phase display for the years 1800 through 2199.
http://tycho.usno.navy.mil/vphase.html

Xphoon
Xphoon sets the X-Windows root window image to a picture of the Moon in its current phase.
http://www.sourceforge.net/projects/xphoon/

Sky & Telescope: Greek Marathon Dated from Phase of Moon
Describes how astronomers used phase of Moon calculations and ancient Greek religious festivals to date the original Marathon run. <small>(July 20, 2004)</small>
http://skytonight.com/news/3309321.html?page=1&c=y

Sky & Telescope: Dating van Gogh's Moonrise
Article identifying the exact date and time of van Gogh's Moonrise painting, based on Moon phase calculations. <small>(June 2, 2003)</small>
http://skytonight.com/about/pressreleases/3307691.html?page=1&c=y