What is astronomical time?

Fortune-telling time is astronomical time (depending on the longitude of the sun), while the time recorded in the average person's mind is clock time, that is, the average solar time in the artificially set standard time zone. If you were born at the beginning and end of a certain time, you will often make mistakes because of "depending on the sun time difference". First, the longitude difference between the standard time and the place of birth:

The world is divided into twenty-four time zones, with longitude divisible by 15 as the central meridian of the region, and each time zone accounts for 15 degrees. In the area east of the central meridian of the time zone, the time should be increased, and in the area west, the time should be reduced by 4 minutes.

China is divided into five time zones:

(1) Central time zone: the central longitude is 120 degrees.

(2) Longshu time zone: East longitude 105 degrees as the central meridian.

(3) New Tibet time zone: 90 degrees east longitude is the central meridian.

(4) Kunlun time zone: 75(82.5) degrees east longitude is the central meridian.

(5) Changbai time zone: the central longitude is 135( 127.5) degrees.

The "standard time" of a time zone is only the unified time of a large area, and it is only the "artificial" time observed by everyone, not the "local time (LMT)"-the real longitude time of every place in the time zone. This principle is used anywhere in the world to add and subtract the longitude of the birthplace and the standard time of the birthplace.

For example, the Central Plains time zone includes Inner Mongolia, Liaoning, Hebei, Shanxi, Shandong, Henan, Anhui, Jiangsu, Hubei, Hunan, Jiangxi, Zhejiang, Fujian, Guangdong, Hainan, Hong Kong, Macau and Taiwan Province Province. When the clock strikes 12 at noon in this large area, only the position on the east longitude 120 degree line is 12, and all other places are less or more than 12. For example, Hong Kong is located at east longitude 1 14 degrees 10 minutes, and 5 degrees and 50 minutes west of east longitude 1 1: 36: 40.