Constellation background

Even at the dawn of civil use, it is easy to connect all kinds of stars in the form of point-to-point combination or paste. Basically, the grouping of constellations is arbitrary. Different cultures will create different constellations, but some obvious shapes are often the same, such as Orion and Scorpio. Historically, there is no official document showing the obvious difference between constellations and constellations. Anyone can arrange and name the combination of stars, which may or may not be universally recognized. Up to now, our own constellation can still be traced back to Sumerian constellation.

The current list is based on the ancient Greek and Roman astronomer Julius Ptolemy of Alexandria (C 85 C 85 C 165). His list of 48 constellations is not only accepted, but also used as the standard of 1 800 years. When a constellation is considered as a combination of only stars, it can always be passed down, and the stars not in the picture can play a leading role in a new combination, or be squeezed again to form a constellation. Two astronomers, John Baer (1572- 1625) and Nicholas Luis liacay (17 13- 1762), tried to expand Ptolemy's catalogue. Bayer added 12 constellations according to Ptolemy's suggestion, while Liakay created some new constellations near the south pole of the celestial sphere, which were never observed in ancient times. Many of their constellations have been accepted, and many of the remaining constellations are out of date. It is necessary to know which stars belong to which constellation. The location rules were finally determined at 1930. The International Astronomical Union (IAU) divides the whole sky into 88 constellations and gives clear boundaries. All other groups are constellations.

The point to remember is—

There are seasonal marks in the northern hemisphere. In the southern hemisphere, the seasons are opposite. The smaller the series, the brighter the stars. So 1 is brighter than 2. The brightest star is 1, but a few brighter stars, after all, are limited and may have negative values.

A real cluster is a star that has a gravitational relationship with each other, not a cluster.