Which period of the twelve constellations _ which period of the twelve constellations is the strongest

Since when is there a constellation of 12?

The origin of constellations

Constellation originated in Babylon, one of the four ancient civilizations. About 5000 years ago, a group of Babylonian shepherds lived a nomadic life in Mesopotamia. In their wandering life as shepherds, they still don't forget to observe the twinkling stars in the night sky every day. Over time, they can see the regular changes of time and season from the dynamics of the stars. Every night, they look at the sheep, observe all kinds of stars, connect the brighter stars with each other, associate all kinds of animals, utensils and even gods they believe in from the connected shapes, and name them, creating the so-called constellation. It is said that there are more than 20 constellation names, such as the so-called zodiac 12 constellation, which was born at that time. Since then, the Babylonians have continued to divide the sky into many regions and put forward new constellations. However, at that time, constellations were of little use, and even fewer were discovered and named. The constellation 12 on the ecliptic was originally used to measure time, not to express people's character as it is now. Around 1000 BC, 30 constellations have been proposed. The Tigris River and the Euphrates River flow from northwest to southeast and flow into the Persian Gulf, so they are also called "two river basins".

After the culture of the two river basins spread to ancient Greece, it promoted the cultural development of ancient Greece. Ancient Greek astronomers supplemented and developed the Babylonian constellation and compiled the ancient Greek constellation table. In the 2nd century A.D., Ptolemy, an ancient Greek astronomer, synthesized the astronomical achievements at that time and sorted out 48 constellations. Connect the main bright stars in the constellation with imaginary lines, imagine them as images of animals or characters, and give them appropriate names in combination with fairy tales. This is the origin of the constellation name. Most of the 48 constellations in Greek mythology live in the northern sky and north and south of the equator.

After the Middle Ages, European capitalism rose and needed to expand outward, and the navigation industry was greatly developed. Ships sailing at sea need navigation at any time, and stars are the best street lamps. Among the stars, this constellation has a special shape and is the easiest to observe. Therefore, constellations have aroused widespread concern. When Magellan sailed around the world in the16th century, he not only used constellations to navigate and orient, but also studied constellations.

1922, the General Assembly of the International Astronomical Union decided to divide the sky into 88 constellations, and their names basically followed the historical names. 1928, the international astronomical union officially announced the names of 88 constellations. These 88 constellations are divided into three celestial regions, 29 in the northern hemisphere, 47 in the southern hemisphere, and near the equator and ecliptic 12.

There are nearly 6,000 stars visible to the naked eye, each of which can be classified as a unique constellation. Each constellation can be identified by the shape of the bright star inside.

In order to facilitate research, people divide the starry sky into several regions, which are called constellations.