Wednesday, 6 June 2012

Venus transit 2012

Venus's 2012 transit across the sun will let researchers test methods for observing Earth-like planets light years away. It's an opportunity that won't be available again until December 2117.


Frequency of Transits
The orbit of Venus is inclined 3.4° with respect to Earth's orbit. It intersects the ecliptic at two points or nodes that cross the Sun each year during early June and December. If Venus happens to pass through inferior conjunction at that time, a transit will occur. Although Venus's orbital period is only 224.7 days, its synodic period (conjunction to conjunction) is 583.9 days. Due to its inclination, most inferior conjunctions of Venus do not result in a transit because the planet passes too far above or below the ecliptic and does not cross the face of the Sun. Venus transits currently recur at intervals of 8, 105.5, 8 and 121.5 years. Since the invention of the telescope (1610), there have only been seven transits as listed below.
 
                                   

                            Transits of Venus:  1601-2200 

                           Date       Universal    Separation     
                                        Time

                        1631 Dec 07     05:19         939 "     
                        1639 Dec 04     18:26         524 "     
                        1761 Jun 06     05:19         570 "     
                        1769 Jun 03     22:25         609 "     
                        1874 Dec 09     04:07         830 "     
                        1882 Dec 06     17:06         637 "     
                        2004 Jun 08     08:20         627 "     
                        2012 Jun 06     01:28         553 "     
                        2117 Dec 11     02:48         724 "     
                        2125 Dec 08     16:01         733 " 
 
  
The 2004 and 2012 transits form a contemporary pair separated by 8 years. More than a century will elapse before the next pair of transits in 2117 and 2125. During the 6,000-year period from 2000 BC to AD 4000, a total of 81 transits of Venus occur.

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2 comments:

  1. nice posting.. thanks for sharing..

    ReplyDelete
  2. I got to look at this amasing moment in history, with the right gear of course but it was the most beautiful things i have ever seen in my life time. Im only 15 years of age but still it was a grand experience for me to see this.

    ReplyDelete

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