Is there any scientific basis for the Gregorian calendar?

The yellow calendar should have been called the "imperial calendar".

It turned out that on the day of the Winter Solstice every year, the emperor presided over a ceremony at the Wumen Gate to announce the calendar for the coming year, hence the name "Imperial Calendar".

I don't know who changed the almanac, and I don't know what to say.

Today's calendar is the Gregorian calendar, which records the sun through the earth's rotation and the year through the earth's revolution. It is very accurate. There is no superstition, of course, there is a foundation of compassion.