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venus passes behind the Sun as "seen" from the Earth at this year's conjunction

 
Anonymous Coward
User ID: 441362
United States
05/28/2008 06:45 AM
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venus passes behind the Sun as "seen" from the Earth at this year's conjunction
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Venus is a morning object until early June when its is at superior conjunction with the Sun on June 9. After that it moves into the evening sky for the rest of the year. The planet will be too close to the Sun to observe for about a month either side of conjunction.

This year's superior conjunction is half way in time between the pair of transits of Venus in June 2004 and June 2012, when the planet is at inferior conjunction and passes across the face of the Sun. As might be expected, Venus passes behind the Sun as "seen" from the Earth at this year's conjunction. The planet will be behind the Sun for about 45 hours, much longer than the transit takes because Sun and Venus will both be moving to the east as seen from the Earth. At a transit, Venus appears to be moving to the west.
Appulse is an astronomical term that refers to the very near approach of one celestial object to another, as seen from a third body. Usually it refers to the close approach of two planets together in the sky, or of the Moon to a star or planet as the Moon follows its monthly orbit around Earth, as seen by an observer located on Earth. An "appulse" can also be referred to as a conjunction.

Where the celestial bodies come so close together that one actually passes over the other, the event is known as an occultation.
Anonymous Coward
User ID: 430172
Australia
05/28/2008 06:56 AM
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Re: venus passes behind the Sun as "seen" from the Earth at this year's conjunction
That's very good, AC 441362, it's something I didn't know before..
Anonymous Coward
User ID: 446728
Australia
06/07/2008 01:16 AM
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Re: venus passes behind the Sun as "seen" from the Earth at this year's conjunction
Did some more looking up.

The conjunction will begin on June 8th at 05:30 AM UT, and will end on June 10th at 02:30 AM UT.

The passage lasts for 45 hours, as you say [link to www.rasnz.org.nz]


Midpoint is on June 9th at 04:00 AM UT [link to www.delscope.demon.co.uk]


Local london summer time will be 5 AM


Eastern Daylight Saving time in the U.S. will be midnight on June 8th [link to buhlplanetarium4.tripod.com]


So in universal time this crossing behind the sun goes from June 8th until June 10th and lasts for 45 hours, or nearly two days.
Anonymous Coward
User ID: 446728
Australia
06/07/2008 10:38 PM
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Re: venus passes behind the Sun as "seen" from the Earth at this year's conjunction
Does Venus start moving behind the sun as 1:30 EDST? :scratching:

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