Right Ascension (Astronomy)

Right Ascension (RA) is a coordinate used in astronomy to pinpoint the location of celestial objects in the sky. It is similar to longitude on Earth but is measured in hours, minutes, and seconds. The celestial sphere is divided into 24 hours of RA, with 0 hours marking the position of the Sun at the vernal equinox. As the Earth rotates, different stars rise and set, and RA helps astronomers identify when a star is visible in the night sky. This system allows for precise navigation and observation of stars, planets, and other celestial phenomena.