Which year is the year of the tropic of cancer?

The tropical year is a calendar year and a cycle of the same solar terms. In order to synchronize with natural time, the tropical year adopts natural timer.

The number is the most reasonable! It is proved by calculation that the precession of the differential rotation solution of the earth is correct.

Earth structure;

The earth is a layered structure, mainly composed of crust, mantle, outer core and inner core. From the inside out, the speed is getting slower and slower.

Data;

The period of revolution sidereal year of the Earth was measured at 6: 09 in 365 with an artificial timer = 10 second.

Sidereal day =23: 56: 4.

With the concepts of calendar and tropic year, tropic year is a Gregorian calendar year, which uses the "solar time" on the surface of the earth's crust.

Calendar found that the time of each tropical year is different, such as 1944 and1997; Time 1944 = 365 days 5: 35: 38; 1997 = 1 min 16 seconds 365 at 6 o'clock, with a difference of 25 minutes and 38 seconds. Therefore, the tropical year adopts the average value of 365 days, 5 hours, 48 minutes and 46 seconds in a century (18th century).

Calculation;

The rotation angle of the earth per sidereal year; The sidereal year ÷ sidereal day× 360 =1318538+0722.

Because the rotation of the earth is counterclockwise, the rotation angle of the earth in the Tropic of Cancer is 360.

Therefore, the earth's rotation angle in each tropic year is =131852.444438+076222-360 =17538.40089.00000000105

Then the earth rotates every sidereal year 13 1838+022. ; Every tropic year, the crust should rotate 15438+0820. 38636.888688866866

However, the length of tropic year 1944 = 365 days, 5: 35: 38. According to the formula of earth rotation angle, the crust rotates in that year.

13 1484.03788 125 。 That is, the longest tropic year (1997) and crustal rotation (13 1490.77) are less than the crustal rotation in each tropic year (1438+022). In this way, the annual average rotation of the earth's crust lags behind the lower mantle by 50.266 arc seconds, which means that the rotation of the earth's crust shortens the tropic year (we call it "the differential rotation of the earth").

Precession is the time difference between the natural "apparent solar time" on the crust surface and the artificial timer in the mantle.