What does right ascension mean?

It is one of the two coordinate data of equatorial coordinate system in astronomy, and the other coordinate data is right ascension.

Magnetic declination (English magnetic declination; Abbreviated as Dec；; The symbol is delta)

The declination is relatively easy. It can be calculated according to the height of the transit on the celestial body (that is, the distance from the Polaris). If the landlord is interested, he can calculate the declination of some bright stars tonight. Relationship: transit height = 90-latitude of observation point+declination. The right ascension is calculated by the time difference between the vernal equinox and the transit, which is much later than the vernal equinox.

Right ascension is a coordinate of celestial equatorial coordinate system. Refers to the arc segment on the celestial equator between the right ascension circle passing through vernal equinox and the right ascension circle passing through celestial bodies, which is denoted by α. From the vernal equinox, measured in the opposite direction of the apparent motion of the celestial sphere on Sunday, from 0h to 24 h.