How does astronomy quickly distinguish water, fire and earth stars in Jin Mu?

First, you should be familiar with the starry sky. Planets are usually big and bright. If you see a strange star, you must be a planet.

It is also helpful to know some astronomical information.

Planetary motion in May

Mercury In the first half of this month, Mercury gradually narrowed its distance from the sun. On may 18, mercury was submerged by the sun's glow and could not be observed. After sunset, Mercury changed from the morning star to the evening star and began to move away from the sun. Before sunrise, it hung low in the northeast sky, and the height of Mercury's horizon increased day by day at sunrise. Mercury stays at 0: 00 on the 8th and at 24: 00 on the 30th.

Venus runs in Pisces, the morning star, and lies in the southeast sky before sunrise. With the passage of time, the distance between Venus and the sun gradually increases, the rising time is also advanced day by day, and the height of the horizon at sunrise is also increasing day by day. In late May, the horizon height of Venus at sunrise has reached 23, and the brightness is about -4.6. Observation conditions are improving day by day. Venus is brightest at 16 on May 2, with a brightness of -4.7. On June 2 1 day, Venus combined with the moon 16, and Venus was located at 7 degrees south of the moon.

Mars is in Pisces. The time when Mars rises from the east is about 3: 30 in the morning. Before sunrise, Mars was located in the southeast sky, and the horizon gradually increased from 15 to 22, and the brightness was about 1.2. Although the observation conditions have improved, they are not ideal. At 4 o'clock on the 22nd, Mars merged with the moon, and Mars was located at 7 degrees south of the moon.

Jupiter goes straight in Capricorn, rising from the east around 1 in the morning, with a brightness of about -2.3, and the observation conditions are getting better and better. 17, 16, Jupiter merges with the moon, and Jupiter is located in the south of the moon. At 2 1 on 25th, Jupiter joined Neptune, and Jupiter is located 0.4 to the south of Neptune.

Saturn runs in Leo, stays at 3 o'clock on June, 5438+08, and then changes from retrograde to anterograde. In May, Saturn turned from the southeast sky to the southwest sky in the middle of sunset, with a brightness of about 0.8. The landing time was around 2 am the next day, and the observation conditions were good. On the 4th 19, Saturn is in the moon, and Saturn is in the north of the moon.