What is the division and naming of constellations?

In order to systematically study the starry sky and conduct international academic exchanges, the International Astronomical Union decided in 1928 to clean up the original data: all the sky should be divided according to "meridian" (called right ascension) and "latitude" (right ascension), and the whole day should be divided into 88 regions of different sizes, each region is a constellation, and each constellation occupies a large or small starry sky. The largest Virgo and Ursa Major are 18 times as large as the smallest Sagittarius and Sagittarius, and there are many stars (visible to the naked eye). For example, both Centauri and Swan have 65,438+050 stars, while Sagittarius has only 65,438+00 stars and corvus corax has only 65,438+05 visible stars.

For the naming of constellations, the International Astronomical Union has taken into account historical habits, except for those not serious constellations, such as the "female cat constellation", most of them have been preserved. In this way, except that the constellations in the southern sky are only known in modern times, they are named after some modern instruments such as clocks, compasses and sextants. Most constellations are still the world of animals and heroes.

The names of constellations are varied, but half of them, that is, 44 constellations, are all animals, not only bears, bears, swans and dolphins, but also dragons, unicorns and phoenixes that are not found in the world. Among them, there are 20 species of mammals, 8 species of birds, 5 species of reptiles, 4 species of fish and 2 species of insects, so some people jokingly call this constellation "the zoo in the sky".