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Coordinates in Astronomy


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The Pole Star
A star that doesn't appear to move in the sky because of it's position almost directly above the spin axis of Earth
The Celestial Equator
An imaginary plane running across the sky, aligning with the equator
Declination
Celestial Latitude, measured in degrees
Right Ascension
Celestial Longitude, measured in degrees or time.
Vernal Equinox
The place on the celestial sphere where the Sun crosses from south to north on the March equinox
'Naked Eye' Planets
Planets you can see in the night sky without any apparatus
Fixed Point Stars
Stars that appear to remain in the same point in the sky in relation to other stars
Retrograde Motion
When stars/planets in the sky appear to move "backwards", or from east to west