How long is it from two minutes to a day?

The vernal equinox refers to four moments, the vernal equinox is the four nodes on the ecliptic, and the vernal equinox is the day when the four solar terms are respectively located.

The relationship between the above three concepts can be expressed as follows: On the vernal equinox, the sun is located in vernal equinox on the ecliptic.

The vernal equinox (March 2 1) and the autumnal equinox (September 23) split in two. At this time, the sun shines directly on the equator, and the global day and night are equal in length. The summer solstice (June 22nd) and the winter solstice (65438+February 22nd) are the second solstice, when the sun shines directly on the Tropic of Cancer, and the extreme day and night reach the maximum range.

Ways and methods of recording time in ancient times

First, burn incense.

We should have seen the characters in the costume TV series say "when a wick smells sweet". It originated from ancient monks who used incense to record their meditation time. At that time, it took about an hour to burn a wick.

Second, the sundial

A sundial is also used to look at time and record time. It is a timing instrument, which uses the shadow direction of the sun at different times to measure the current time. It consists of a dial and a dial.

Third, there is a leak.

Leaky carving, also called leaky pot, is timed by dripping water. Early leaky carving generally let water flow out of the hole of the pot, and there were floating arrows falling with the water in the leaky pot. You can check the current time by the scale indicated by the floating arrow.