June 6, 2009, the world’s most rare astronomical phenomenon of the” transit of Venus “staged, which is of this century, people in the last witness this spectacular astronomical phenomena. In accordance with the cycle, the next transit of Venus “appears 105 years after the 2117. China news agency hair Tomita BEIJING, June 6, the wonders of electricity (Liu Huan) rare astronomical phenomena of the transit of Venus today staged photo
the wonders of electricity (Liu Huan) rare astronomical phenomena of the transit of Venus today staged photo, China is one of the best observation points in the worldwide . Assigned to 12:49 the transit of Venus from 6:09 up to six hours during this time, Venus is like a small black spot in the sun’s surface as slow-moving. It is reported that since the invention of the telescope so far of 400 years ago, humans experienced a total of six times the transit of Venus. Last June 8, 2004, and the next is December 11, 2117, have to wait 105 years.
What is the transit of Venus?
transit of Venus, like eclipses, also a kind of eclipse phenomenon. Two points of intersection of the orbital plane of Venus and the Earth, if l, before and after a short period of time coincided with Venus in descending node together, it is possible to see Venus from the day the surface slowly across the scene, namely the transit of Venus. Venus, as a round face is much less than the sun, as round face, making it the performance of the day the surface of a slow-moving black specks, and therefore, the transit of Venus “is also seen as a” small eat. ”
Earth orbit and the orbit of Venus in the same plane, then each inferior conjunction occurs about 584 days once transit. The reason why the rare transit of Venus, because Venus and the Earth orbits the angle of 3 ° .4, timely Venus and the sun’s angular distance of up to 8 ° .9. The sun, as round face does not exceed 30 ‘, so the inferior conjunction with the intersection is very close to occur transit.
vividly describe the transit of Venus, just like the sun, his face grow a dynamic circular mole. Which, Venus began to enter the round face of the sun in Beijing between 6 am and 09 minutes and 41 seconds, Venus completely leave the round face of the sun is at 12 noon 49 minutes and 31 seconds, the whole process lasted over six hours. Venus is like a small round mole, in more than six hours of time, slowly over the sun, a round face.
“black drop” phenomenon is the biggest thing in the entire transit of Venus. The so-called black drop, in fact, the optical phenomena. Against the light and the two fingers in close proximity to when the finger does not contact, but you can see the existing shadows link them up. The “black drop” phenomenon of the transit of Venus, Venus and the sun is about to close and separate the two planets seems to have suddenly “integration”, it is wonderful.
how observed the transit of Venus?
many astronomers are prompted to pay attention to safety observation, looked up to heaven in the eye measures the premise. If the sun is directly visual, will lead to strong ultraviolet and infrared radiation, direct access to the retina, causing visual impairment and even blindness. In view of this, researchers believe that observing the transit of Venus “There are two methods of security.
First, use a filter to filter the harmful rays filter of security on the market such as welding machine glass on the 14th, in a specialized welding tool supply store to buy from a telescope store or club of amateur astronomers take enough special observation lens.
“pinhole camera”. Observer can make your own a huge cardboard box, make a small hole in the carton side, the aperture is about one centimeter or two centimeters, its function is similar to a “lens”, and a white paper on the relative and aperture one end, as a “screen”. Then occurs in the transit of Venus will be a box placed in a net short position, surrounded by other objects blocking, so you can observe the transit of Venus on the screen process.
Beijing early this morning the sun by clouds obscured and difficult observation. After seven, the cloud amount is reduced, the sun shine, professional equipment should be observed the transit of Venus. An American astronomer specifically pointed out:
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