Do you use the apparent solar time of Wei Zi Dou?

For a place, the sun must be directly above it at noon.

In ancient times when magic numbers were created, people used to use the height of the sun to calculate time. That is, depending on the sun.

Therefore, in any case, the arrangement of Wei Zi barrels must use the apparent solar time.

A person's birth time may be biased due to inaccurate memory or the influence of climate (Dou Shu's book mentions that thunderstorm weather should be calibrated with a compass), but there will still be errors in actual operation.

In order to solve this problem, a relatively complicated but most reliable method is: three interruptions. That is, two hours before and after the chart verification.