An imaginary sphere of arbitrarily large radius centered on Earth, upon which all celestial objects are projected. Useful for locating objects using coordinates like right ascension and declination, though objects are at vastly different actual distances.
A group of stars forming a recognizable pattern traditionally named after its apparent form or a mythological figure. Th...
A belt-shaped sky region extending about 8 degrees north and south of the ecliptic. It includes the constellations throu...
An astronomical event when one celestial body moves into the shadow of another. Solar eclipses occur when the Moon passe...
Dive deeper into celestial sphere and related concepts on Cosmos Observatory.