November 9 will be "transit of Mercury," to wait for the next 25 years observation.

<P> World Science reports (tech.) Morning News on June 9 there will be "transit of Mercury" scene. .According to forecasts, the Shanghai 6:16 after sunrise, if the weather is fine, Mercury can be observed as a small black dots, from the bottom up slowly "crawl" over a huge day surface. .</ P> <P> According to Jiangsu Astronomical Society Ma Weihong introduced the principle of Mercury with the solar eclipse occurred similar to that of the Sun, Mercury, the planet is just a straight line, gradually cover Day of Mercury before. .French astronomer from the 1631 transit of Mercury was first observed, to 2003, the last occurrence of the planetarium, there were 50 times the global average of 13 times per century occur only. .The next transit of Mercury observed in China, until 2032. .</ P> <P> the transit from at 3:12 on the 9th starting from sunrise to around 8:10 early end of transit, sustainable observing tens of minutes. .Experts remind that naked eye observation should be careful to prevent burns the eyes. .In addition to using telescopes plus filter methods, can be solar image onto a white surface, observed "black spot" of the projection. .</ P> </ p>.