On this day, 49 years ago, on March 21, 1976 (February 21, 1976 lunar calendar), the most beautiful comet of this century, Comet West, left the earth. Comet West showed its beauty in the afterglow of New Year's Eve (February 1976) On March 21, 1976, the most beautiful comet of this century, Comet West, left the earth. On November 5, 1975, it was detected by the German astronomer West from the negative film taken by the European Southern Observatory, and it was predicted that it could become a comet visible to the naked eye when it passed perihelion on February 25, 1976. In fact, the comet had reached a brightness of -1 a few days before perihelion, and the tail was thick and short, visible in the glow of dusk, and then set west. On February 25, 17 hours after perihelion, it reached an unprecedented brightness of magnitude -3, visible to the naked eye for 10 minutes, before falling west, becoming the fourth comet visible to the naked eye during daylight in this century. From March 5 to 7, the tail reached 30 degrees to 50 degrees, the comet head reached a brightness of magnitude 1, and the tail was very wide. The two tails - the straight gas tail and the white, fan-shaped dust tail - were clearly discernible. Comet West was more brilliant than expected, making it the most beautiful large comet of this century. Astronomers used telescopes to find that the nucleus of the comet broke into two pieces on March 5, and further divided into four pieces on March 10-11, one of which disappeared on March 21. This comet has all the conditions 1 to 5.