✔ 最佳答案
水星凌日是一種天文現象。當水星運行至地球和太陽之間,如果三者能夠連成直線,便會產生水星凌日現象。觀測時會發現一黑色小圓點橫向穿過太陽圓面,黑色小圓點就是水星的投影。水星凌日發生在五月初或十一月初,平均每百年出現十三次水星凌日的現象。
最近發生的水星凌日:2003年5月7日、2006年11月9日、2016年5月9日。
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Mercury comes between the Sun and the Earth, and Mercury is seen as a small black dot moving across the face of the Sun.On the 9th of November, The planet Mercury could be be best seen going across the sun. The best place to have viewn it was in Hawaii.
Transits of Mercury with respect to Earth are much more frequent than transits of Venus, with about 13 or 14 per century, in part because Mercury is closer to the Sun and orbits it faster.
Transits of Mercury can happen in May or November. November transits occur at intervals of 7, 13, or 33 years; May transits only occur at intervals of 13 or 33 years. The last three transits occurred in 1999, 2003 and 2006; the next will occur in 2016.
During a May transit, Mercury is near aphelion and has an angular diameter of 12"; during a November transit, it is near perihelion and has an angular diameter of 10".
[edit] Grazing transits of Mercury
Sometimes Mercury only grazes the Sun during a transit. In this case it is possible that in some areas of the Earth a full transit can be seen while in other regions there is only a partial transit (no second or third contact). The transit of November 15, 1999 was such a transit, and the previous one before that was on October 28, 743. The next such transit will occur on May 11, 2391.
It is also possible that a transit of Mercury can be seen in some parts of the world as a partial transit, while in others Mercury misses the Sun. Such a transit last occurred on May 11, 1937, and the previous one was on October 21, 1342. The next such transit will occur on May 13, 2608.
[edit] Simultaneous transits
The simultaneous occurrence of a transit of Mercury and a transit of Venus is extremely rare, and will next occur only in the years 69163 and 224508.
The simultaneous occurrence of a solar eclipse and a transit of Mercury is very rare. The next solar eclipse occurring during a transit of Mercury will be on July 5, 6757, and will be visible in Eastern Siberia.
[edit] References
Cunningham, Clifford J., "Mercury's Time to Shine," Mercury Sep-Oct 2006.
A historical painting is associated with this event by artist Johanne Eckstein, a copy of which recently sold on e-bay with the following description: The Transit of Mercury, on the 7th of May 1799,a group of amateur astronomers stand in front of an inn either gazing through telescopes at the painted sign of star, or Mercury, upon which sits an owl, or else carefully scrutinizing its reflection in a bowl of punch, a parson in riding boots draws on his pipe while he studies his glass, his telescope resting in his hat, lower left, an ape drinks from a bottle, lower right.
詳情 :
http://en.wikipedia.org/wiki/Transit_of_Mercury