Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2001 January 4
See Explanation.  Clicking on the picture will download 
 the highest resolution version available.

Third Millennium, First Eclipse
Credit & Copyright: Fred Espenak (courtesy of

Explanation: The first eclipse of the third millennium is coming up! A total lunar eclipse mainly visible from Europe, Asia, and Africa, will occur on January 9th as the full Moon glides through the long, but not so dark shadow of planet Earth. Why not so dark? Sunlight is actually scattered and refracted into Earth's shadow by the atmosphere, a circumstance which can help create some striking photographs of the eclipsed Moon. For example, this image is a composite of photographs taken during the July 2000 total lunar eclipse. Early and late phases of the eclipse flank a deep exposure made during totality. The feeble sunlight still shining on the lunar surface gives the Moon a dramatic dark red cast. While the July 2000 eclipse was not the first or last of any millennium, it was remarkable for being the longest eclipse for about the next 1,000 years, totality lasting an impressive one hour and 47 minutes. Totality for the January 9th eclipse will last just over one hour.

Tomorrow's picture: Second Millennium, Last Eclipse

< | Archive | Index | Search | Calendar | Glossary | Education | About APOD | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/GSFC
& Michigan Tech. U.