Lunar Phases

The apparent shapes of the Moon as seen from the Earth, which are caused by the Moon's orbit of the Earth once every 29.5 days. The same phase will fall on the same date of the year according to the Saros cycle, every 18 years, 11 days, and eight hours. See our moon phases page for more information.

Resources

Radio Programs

Harvest Moon The full Moon lights the way Monday, September 8, 2014
Moon and Companions Quartering the Moon Friday, February 21, 2014
Moon and Aldebaran Peeking at the Moon’s backside Saturday, January 11, 2014
Long-Night Moon Filling the night with moonlight Monday, December 16, 2013
A New Cycle Beginning a new lunar cycle Friday, May 24, 2013
Moon and Regulus Lining up some bright moonlight Friday, May 17, 2013
Long-Night Moon Lighting up the long night Thursday, December 27, 2012
Moon and Companions Taking a peek at the Moon’s backside Saturday, November 10, 2012
Harvest Moon Celebrating the Mid-Autumn Moon Saturday, September 29, 2012
Blue Moon A “colorful” astronomical rarity Thursday, August 30, 2012
Moon, Spica, and Saturn Parsing the changes of the Moon Thursday, May 31, 2012
Annular Eclipse II Cycling through centuries of eclipses Sunday, May 20, 2012
Moon and Companions Reflections on a quarter Moon Sunday, January 15, 2012
More Moon and Venus Changing the face of the Moon Tuesday, December 27, 2011
Hunter’s Moon Giving the Moon a two-faced appearance Tuesday, October 11, 2011
Calendars Following the cycles of the sky Friday, September 23, 2011
Harvest Moon Balancing the Harvest Moon Sunday, September 11, 2011
New Moon Blazing through the lunar night Friday, July 1, 2011
First-Quarter Moon Half a Moon equals a quarter Monday, April 11, 2011
Harvest Moon A beautiful astronomical coincidence Wednesday, September 22, 2010
Blue Moon A once-in-a-blue-moon event Wednesday, December 30, 2009
Apollo Moon A journey to an ancient lava plain Monday, July 6, 2009
Short-Night Moon The Moon hurries across the sky Sunday, June 7, 2009
Moon and Venus The Moon scurries on Thursday, February 26, 2009

Featured Images

Venus, Mercury, and the earthshine-illuminated crescent Moon
Lighting the Shadows Friday, May 30, 2014
First-quarter Moon
Moonwatch Saturday, September 22, 2012
Lunar Sunrise Friday, June 12, 2009
Lots of Moonlight Thursday, December 11, 2008

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