The changing law of the starry sky: rising in one day, setting in the west, and gradually going west within one year.
Four seasons starry sky is an astronomical concept. When winter comes and summer goes, the stars move. This shows that with the change of seasons, the starry sky in the four seasons is also changing. Because the relative positions of the earth and the sun are constantly changing during the movement of the earth around the sun, the astrology seen at the same night in a year is different in different seasons.
Starry sky in spring
The most prominent starry sky in spring is the "Spring Triangle". Spring triangle refers to three bright stars hanging high in the spring sky, arranged in a triangle. The three bright stars are Emperor I of Leo, Arcturus I of Virgo and arcturus of Patriarch. ?
The main constellations in the sky in spring are Ursa major, Ursa minor, Leo, Capricorn, Canis major, Virgo, Raven and Ophiuchus.
In the direction slightly northeast of the zenith, you can see the connection between the Big Dipper and Doukou, pointing to the North Star. At this time, bucket handle points to the east, so there is a cloud: bucket handle points to the east, and the world is spring; Bucket handle points to the south, and the world is summer; Bucket handle points to the west, and the world is autumn; The handle of the barrel points to the north, and the world is winter.
Summer sky
The important symbol of the starry sky in summer is the Milky Way, a light belt extending from the northeast horizon to the south horizon, and a "summer triangle" consisting of three bright stars, namely Vega (Alpha Lyra), Altair (also called Alpha Hegu and Alpha Aquila) on both sides of the Milky Way and Tianjin IV (Alpha Cygnus) in the Milky Way.
Summer is a good time to see the stars. Look west after dark, and you will find Leo. To the east of Leo are Virgo and Scorpio. In the south of the sky, a bright red star shines in the lower sky. It is the main star of Scorpio, Antares, and a bright star on the ecliptic.
The obvious feature of Scorpio is that there are three stars scattered in an arc at equal intervals, and Antares is just at the center of the circle. In ancient astronomy in China, Scorpio belongs to the Shang star and Orion belongs to the Laonian star. It just rises and falls and never meets, so a poet said, "It is almost as difficult for friends to meet each other as the stars in the morning and evening."