The biggest relationship with China's traditional twenty-four solar terms is () A moon revolution B moon rotation C earth rotation D earth revolution.

Equinox and autumnal equinox are equally divided on the ecliptic. If the revolution speed of the earth is uniform, then the time it takes for the sun to run from the vernal equinox to the autumnal equinox should be the same as the time it takes for the sun to run from the autumnal equinox to the vernal equinox, which is half of the whole year.

The speed of the earth's revolution is uneven, so the time to travel the same distance must be unequal. Depending on the sun from the vernal equinox to the summer solstice to the autumnal equinox, the earth's revolution speed is slow, which takes more than 186 days, which is longer than half of the whole year. This is the summer half year in the northern hemisphere and the winter half year in the southern hemisphere. Relying on the sun from the autumnal equinox to the vernal equinox through the winter solstice, the revolution speed of the earth is relatively fast, which takes 179 days, less than half of the whole year. This is the winter half year in the northern hemisphere and the summer half year in the southern hemisphere.

Extended data

The annual movement of the sun

1. The annual parallax ellipse of the sun is the ecliptic, which reflects the position of the earth's orbital plane on the celestial sphere. The vernal equinox and equinox indicate the position of the intersection of the earth's orbital plane and the equatorial plane on the celestial sphere.

The position of the sun on the ecliptic reflects the position of the earth in its orbit. If the sun is in vernal equinox and the earth is at the autumnal equinox.

The apparent motion direction of the sun on the ecliptic reflects the direction of the earth's revolution.

4. The period of the annual apparent motion of the sun reflects the period (year) of the earth's revolution.

The angle of the sun's apparent motion every year reflects the angular velocity of the earth's revolution.

Baidu Encyclopedia-The Revolution of the Earth