Venus transit is the sky phenomenon that occurs when Venus disc over a small disc of the Sun. Because the disk of Venus is much smaller than the Sun and is located quite far from Earth it is in transit, Venus will appear as a small object passing in front of the Sun. This event has the same concept as the eclipse of the Sun, where the the Moon disc is almost covered the entire Sun disc facing the Earth. Thing that distinguishes only the size of the moon disc and the disc of Venus across the Sun.
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| Measuring Venus transit times to determine solar parallax. (Picture from: http://commons.wikimedia.org/) |
This phenomenon is considered very rare due to Venus and Earth are both around the Sun and the opportunity for the Earth, Venus, and the Sun to be on the 'line' that the same is quite rare. Unlike the case with the moon around the sun along with the Earth. In addition, the trajectory of Venus around the Sun is aligned with the Earth's path around the Sun, making it increasingly rare phenomenon of Venus transit. Venus has the inclination of the trajectory (different angles) of 3.4 ° to the path of Earth.
In Indonesia, the Venus transit event is one phenomenon that became the historical development of astronomy. On the transit of Venus in 1769, observations were made in what is now Jakarta Batavia by Johan Mohr. Mohr founded a private observatory located at the Gang Torong estimated to be around Glodok area today.
Venus Transit this time will occur on June 6, 2012. Duration of which is about six hours with the details, at 05:09 WIB. when the first contact or first disc of Venus will 'touch' the disk of the Sun. Peak will occur at around 8:29 WIB. and ended at 11:49 WIB.
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| Venus transit on June 8, 2004. (Picture from: http://presurfer.blogspot.de/) |
The last time the transit of Venus was on June 8, 2004. And after the transit of Venus this year, the same phenomenon will happen again in 2117, 2125, and so on. This happens because Venus transit cycle will be repeated every 105.5 years and 121.5 years. Judging from the year they are incurred, this phenomenon is the last Venus transit that most of us can observe. Because of this phenomenon will be repeated as long as 105 years.
This phenomenon can be observed in all parts of Indonesia. However, if for the first contact, a great place to observe the eastern part of Indonesia. The more western location of the observation, it will only get a peak and finally contacts only.
Venus transit observations were originally made for u calculate the diameter of the Sun. However, since it is now known, this phenomenon may be a separate entertainment for lovers of astronomy. This phenomenon is certainly not going to be missed by amateur astronomers and professional astronomers.
To observe the Venus transit, better use of the telescope's sun filter for a small disc of Venus and the sight-threatening eye directly from the sun. Moreover, it can use the binoculars are projected onto a plane as if looking directly will burn the retina of the eye. If you do not have both, can also use sun glasses that have been equipped with special filters and safe way to observe the Sun. *** [RHISA AZALIAH | PIKIRAN RAKYAT 10052012]
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