Total Eclipse of the Sun 2008 August 01 Fred Espenak NASA’s Goddard Space Flight Center 1.

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Presentation transcript:

Total Eclipse of the Sun 2008 August 01 Fred Espenak NASA’s Goddard Space Flight Center 1

Solar Eclipse Geometry 4 To Sun Earth New Moon Earth and Moon: Solar Eclipse Path Penumbra Umbra Path of Totality Moon During a total solar eclipse the Moon’s two shadows sweep across Earth. 2

Partial Phases of a Total Solar Eclipse Every total eclipse begins with a series of partial phases which may last an hour or more. However, the total phase or “totality” never lasts more than 7.5 minutes. This time series photo shows an entire total solar eclipse, from start to finish over a period of over two hours. 3

Eclipse Shadows Astronomy Picture of the Day - August 13, 1999 Credit: E. Israel When sunlight passes through gaps between leaves of a tree, the shadows on the ground show little images of the eclipse happening in the sky above. This is the same principle as the pinhole camera. 4

Eerie Twilight During a Total Solar Eclipse During “totality” the landscape is bathed in an eerie twilight. Bright stars and planets are visible. Astronomy Picture of the Day January 08 Credit: Olivier Staiger 5

“Diamond Ring” Effect Before Totality Begins In the last seconds before totality begins, the remaining bit of Sun resembles a dazzling jewel as the ring-like corona appears. Astronomy Picture of the Day - June 21, 2001 Credit: Fred Espenak 6

Glorious Solar Corona The sun’s glorious corona is composed of hot, rarified plasma with a temperature of 1 to 2 million degrees Centigrade. It is only visible during a total eclipse when the Moon hides the Sun’s brilliant disk. Astronomy Picture of the Day - Sept. 15, 1999 Credit: Fred Espenak 7

Partial Solar Eclipse Partial eclipses are visible over a much larger part of Earth than total eclipses. So they are seen by many more people. Partial Eclipse of Oct. 14, 2004 (Hawaii) Credit: Fred Espenak 8

Annular Solar Eclipse Annular Solar Eclipse of May 10, 1994 (Toledo, Ohio) The solar corona is NOT visible during an annular eclipse. The remaining ring of sunlight hides the corona in its glare. 9

Frequency of Solar Eclipse Types Partial35% Annular33% Total27% Hybrid 5% Eclipses per Year: 2 to 7 Totals per Year: 0, 1 or 2 Fred Espenak, NASA’s GSFC 10

Total Solar Eclipse of August 01,

Total Solar Eclipse – 2008 Aug 01 Canada Greenland Russia Mongolia China 12

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NASA Solar Eclipse Bulletins n Bulletin Prepared for Major Solar Eclipses – All Total & Some Annular – IAU Working Group For Eclipses n Published months before eclipse n Hard Copy Available Contact: n Electronic Version on Web eclipse.gsfc.nasa.gov/SEpubs/bulletin.html 23