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Asterism (astronomy)
Pattern of stars recognized on Earth's night sky
Astronomical coordinate systems
System for specifying positions of celestial objects
Celestial cartography
Part of astronomy concerned with mapping of stars
Celestial equator
Projection of the Earth's equator out into space
Celestial sphere
Imaginary sphere of arbitrarily large radius, concentric with the observer
Constellation
Group of stars forming a pattern on the celestial sphere
Declination
Astronomical coordinate analogous to latitude
Ecliptic
Apparent path of the Sun on the celestial sphere
Epoch (astronomy)
Moment in time used as a reference point in astronomy
Equatorial coordinate system
Celestial coordinate system used to specify the positions of celestial objects
Equinox
Semi-annual astronomical event where the Sun is directly above the Earth's equator
Equinox (celestial coordinates)
Astronomical location
Galactic coordinate system
A celestial coordinate system in spherical coordinates, with the Sun as its center
Horizon
Apparent curve that separates earth from sky
Hour angle
Coordinates used in the equatorial coordinate system
List of Chinese star names
List article
March equinox
The equinox on the Earth when the Sun appears to leave the southern hemisphere and cross the celestial equator
Meridian (astronomy)
Great circle passing through the celestial poles, the zenith, and the nadir of a particular location
Nadir
Direction pointing directly below a particular location
Position angle
Measurement relating to observed visual binary stars
Right ascension
Astronomical equivalent of longitude
September equinox
When sun appears directly over equator
Solstice
Semi-annual astronomical event where the Sun is farthest from above the Earth's equator
Spherical astronomy
Branch of astronomy about the celestial sphere
Summer solstice
An astronomical phenomenon in which the Earth's axial tilt toward the Sun is at its maximum (currently 23.44°)
Tropical year
Period of time for the ecliptic longitude of the Sun to increase 360°
Winter solstice
Astronomical phenomenon when the Earth's northern hemisphere's axial tilt toward the Sun is at minimum (currently -23.44°)
Zenith
Imaginary point directly above a particular location, on the imaginary celestial sphere
Zodiac
Area of the sky divided into twelve signs