The Yellow pole

The Yellow pole

This data is reviewed by the project of data compilation and application of Science Encyclopedia of science popularization in China.

The Yellow pole

In astronomical terms, it refers to the point where the line perpendicular to the earth's orbit around the sun, the ecliptic, intersects with the virtual celestial sphere.

There are two yellow poles: the North Yellow pole is in the constellation Draco. The south pole is in Xiphophorus. Due to precession, the celestial pole orbits around the Yellow pole in a circular orbit with a period of about 25800 years. the coordinate value of the Yellow pole on August 26, 2009 is: when it appears in the equatorial coordinate system, this is the inclination of the earth's rotation axis. yellow is highly unlikely to be at the zenith in a dark sky. By definition, the Yellow pole is 90 degrees away from the sun, so when the Yellow pole is at the zenith, the sun must still be on the horizon.

Chinese PinYin : Huang Ji