April 20, 1910 (March 11) Gengxu, Halley's Comet reaches perihelion.



scientists first shooting and the spectroscopic observations
20, 1910 Halley's Comet reaches the perihelion of Halley's Comet. the
Halley's Comet is the only forecast the Great Comet of 1705, British astronomer Harley uses Newton's law of universal gravitation projections the regression cycle track, in recognition of his achievements the caller and the comet named Harley. It became 32 times return to record "regular customers" since 240 BC. Halley's Comet cycle of about 76 years. The secondary appeared in the 20th century. Reunification in 1910, in good condition, and thus the image is quite spectacular: April 20 over perihelion tail light was visible to the naked eye, over a month after the perigee tail up to 125 degrees to 150 degrees. The time, because it only 2500 million meters away from Earth, it was worried that all life on Earth will be completely enveloped by the tail death. In fact, the tail is very thin, and the Earth is not anything unusual occurred. But the sight of Halley's Comet swept yao occasion really people then gripped.
British astronomers Harley
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