Current Phases of the Moon
Moon Phase Screensavers & Moon Products
Take a look at these 3D moon screensavers, software and other moon products. Some great gift ideas! The 3D screen savers are amazing.
Brief Explanation of the Moon Phases
The phases of the moon are caused by the relative positions of the
earth, sun, and moon. The moon goes around the earth in 27.3 days, or
27 days 7 hours 43 minutes, on average. This measurement is relative to
the stars and is called the sidereal period or orbital period. However,
because of the earth's motion around the sun, a complete moon cycle
(New Moon to New Moon) appears to earthbound observers to take a couple
of days longer: 29.5305882 days to be exact. This number is called the
synodic period or "lunation", and is relative to the sun.
The sun always illuminates the half of the moon facing
the sun (except during lunar eclipses, when the moon passes through the
earth's shadow). When the sun and moon are on opposite sides of the
earth, the moon appears "full" to us, a bright, round disk. When the
moon is between the earth and the sun, it appears dark, a "new" moon.
In between, the moon's illuminated surface appears to grow (wax) to
full, then decreases (wanes) to the next new moon. The edge of the
shadow (the terminator) is always curved, being an oblique view of a
circle, giving the moon its familiar crescent shape.
(some of above information courtesy of NASA http://liftoff.msfc.nasa.gov)
 New Moon |
 Waxing Crescent |
 First Quarter |
 Waxing Gibbous |
 Full Moon |
 Waning Gibbous |
 Last Quarter |
 Waning Crescent |
Other Lunar Phases Information
(all links open in the same new window)
NASA, USNO
USNO moon phase data - U.S. Naval Observatory Astronomical Applications Department website, a great all-around online tool for "raw" data and information about the sun, moon, and starsLunar Eclipse Information
NASA Lunar Prospector Mission - a look at the events surrounding the first NASA Moon mission in 25 years! Lots of information and pictures.
moon pictures - very interesting lunar images! This NASA page has over 130 pictures (thumbnails) of the moon. Click on a thumbnail to for more info. Close-ups of the surface of the moon, distance views, astronauts, moon landings, more.
Mr. Eclipse - breathtaking eclipse photos, both lunar and solar, probably the best eclipse photography site anywhereEducation / Classroom Moon Phases Activities
International Occultation Timing Association - An index and information site, a more technical and in-depth look at lunar (and other) eclipses
K-12 lunar phases activity from NASA - rather than use chalkboard diagrams to illustrate the phases, this activity uses actual objects (pencil, styrofoam ball) to help students grasp the concepts; Newton's Apple has a similar but more detailed moon phase lesson plan for elementary-age studentsThere are many theories and thoughts about the effects of the moon on people, animals, and the natural world. Here are a few interesting links:
lunar phases explanation from factmonster.com - here's a good basic overview of the phases of the moon from the Family Education Network
phases of the moon online movie - this is a short movie taught by a professional astronomer and a Newton's Apple scientist in an interesting, conversational manner, using large 3-D moon and earth spheres and simulated sunlight to demonstrate how the moon phases work
Earth-Moon-Sun system video diagrams - from NOAO (National Optical Astronomy Observatory), these QuickTime online video clips and animations are an excellent way to illustrate the moon's phases
moon and the tides - this is a concise page on how the moon affects the tides by its phase (full moon, new moon, etc) and its position (perigee, apogee)Other:
how moon phases affect animals - discusses the "Solunar Theory" that affects fishing and hunting activities
the real scoop on moon phases - another article on how the moon phases affect angling
all about the moon - here's a website you'll want to watch for almost anything moon related including a moon phases calendar
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