How many days does each solar term differ?

What we generally know now is that the sun and the earth have been constantly revolving and rotating. The earth's orbit around the sun is usually called the ecliptic, and the 24 solar terms are divided according to the position of the sun on the ecliptic. First of all, when the sun shines directly on the equator, it is designated as "the longitude of the Yellow River is zero", that is, the vernal equinox. From here, every advance of 15 degrees is a solar term, which extends downwards from the vernal equinox, Qingming, Grain Rain, Changxia and so on. After running for a week, it will return to the vernal equinox, which is a 360-degree tropic year, so it is divided into 24 solar terms.

So, basically, the difference is about 15 days.