The historical prime meridian runs through a telescope established in 1851 by Sir George Airy at the Royal Observatory at Greenwich, England. The observatory’s line in the pavement is a major tourist ...

June 22 marks the 350th anniversary of the Royal Observatory Greenwich, the home of the historic Prime Meridian that is considered by many to be the birthplace of modern astronomy. To celebrate, we're ...

The Celestial Sphere Definitions Meridian: An Imaginary North-South Line In The Sky Passing Directly Overhead. It Divides The Sky Into Eastern And Western Halves…. Celestial Poles: The Points On The ...

Definitions and Concepts: Celestial Sphere, Altititude, Azimuth, Zenith, Meridian, Celestial Poles, Celestial Equator, Circumpolar Stars, Ecliptic. The brightness scale for stars; How objects in the ...

In January 2025, this convergence will happen in the western sky shortly after sunset. The grouping will occur within a few degrees of the celestial sphere, making them visible together through ...

Since antiquity, the sky has been thought of as a bowl, or celestial sphere, that's directly overhead. The equatorial coordinate system that astronomers use to find stars and other objects is ...

This nearly perfect "cosmic bubble" has made headlines around the world — here's what all the fuss is about. There's no shortage of round celestial objects in our universe. Planets, moons and ...