What's the abbreviation for cancer?

Cancer English cancer, abbreviated as Cnc.

Cancer is one of the zodiac signs. Cancer is a medium-sized faint winter constellation with an area of 506 square degrees, accounting for about 1.2% of the celestial sphere. Every year, at the night of 65438+1October 29th, the tumor center passes through the transit.

Cancer is one of the darkest constellations, and the brightest star in the constellation is only 3.5. In cities with serious light pollution, it is difficult to see cancer directly with naked eyes, but its location can be determined by other bright stars around.

Study history

Although there are few bright stars in Cancer, the ancients have long noticed it. Among the 48 constellations proposed by Ptolemy, an ancient Greek astronomer, there is Cancer. In ancient China, the starry sky in Cancer area was called haunted house and willow house.

Cancer is famous in ancient times, on the one hand, because it is located on the ecliptic, from July 2 1 to August1every year. The sun moved from the earth to Cancer. On the other hand, it is also related to the amazing "ghost cluster" M44 in this constellation.

In the central part of Cancer, Ghost I (θ Cancri), Ghost II (η Cancri), Ghost III (Asellus Borealis) and Ghost IV (Asellus Feiyun) form a quadrilateral, in which there are a group of celestial bodies like clouds and, which are like stars but not stars: the ancients in China imagined this scene as a "ghost"-the quadrilateral is a car (and).