Leo (Latin: Leo, astronomical symbol:? ) One of the zodiac signs, with an area of 946.96 square degrees, accounting for 2.296% of the whole day. Among the 88 constellations in the whole day, this region ranks 12. There are 52 stars with Leo brightness greater than 5.5, the brightest star is Xuanyuan XIV (Leo α), and the apparent magnitude is 1.35. On the night of March 1 every year, Leo center passes through the transit.

Xuanyuan XIV, the brightest star in Leo, is a blue and white star with an apparent magnitude of 1.35, ranking 2nd1in the whole night sky, symbolizing the heart of the lion. Because Xuanyuan XIV is above the ecliptic, the astronomical phenomenon that the moon covers Xuanyuan XIV occasionally occurs. ?

Leo has been established for thousands of years. It is generally believed that in ancient Egypt more than 4,000 years ago, when the sun moved to the sky of Leo in midsummer every year, a large number of lions gathered in the Nile Valley to enjoy the cool, hence the name Leo.

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The Leonid meteor shower, known as the king of meteor showers, is a meteor shower connected with Comet Templeton, with a period of about 33 years. Every year 165438+ 10 month 14 to 2 1 or so. Generally speaking, the number of meteors is about 10 to 15 per hour, but the Leonid meteor shower has a peak every 33 to 34 years, and the number of meteors can exceed several thousand per hour.

This phenomenon is closely related to the period of Comet Temple Tuttle. ? Leonid meteor shower occurs every year from 1 14 to 2 1 in 10, especially from 1 17 in 10, and the general azimuth is about 40 degrees north.

Leonid meteor shower is caused by the existence of a comet named Temple-tuttle (55P/ Temple-tuttle). Leonid meteor shower in 20 12 was staged around midnight on165438+1October 17, and the maximum discharge was 15 per hour. 20 13, 165438+ 10, 17 The king of meteor showers visited the earth, and two "great" meteor showers appeared.

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