Diagram of a Solar Eclipse

The Moon This insertion likely identifies the smaller celestial body in the diagram responsible for the eclipse.

In traditional Chinese astronomy, "same longitude and same latitude" (tongjing tongwei) describes the precise alignment of two celestial bodies in the sky, a state known in modern astronomy as syzygy.

Solar Eclipse (Rishi): Literally "the sun being eaten," the phenomenon where the moon passes between the Earth and the Sun.
Same Longitude (Tongjing): Alignment along the celestial degrees of the east-west axis.
Same Latitude (Tongwei): Alignment along the north-south axis.
Obscured by the Moon (Yueyan): The physical blocking of sunlight by the lunar disk.

The diagram described in the source depicts the Sun being darkened at the top of the frame while the Moon sits below it, illustrating the moment of overlap. The mountains at the bottom represent the earthly horizon from which the observer views this celestial event.