The positions of stars are measured by angles seen from earth.
Asonomers picked two fixed positions to meaure from:
THE POLE STAR & THE CELESTIAL EQUATOR
The pole star does not seem to move as it's almost directly above the North Pole (and spin axis) of earth
The celestial equator is an imaginary plane running across thr sky, extending out formt he earth equator.
The two angles used to measure positions in the sky are are:
Declination - celestrial lattitude measured in degrees
Right Ascension - celestrial longitutde measured in degrees or time
All planets in the soloar system orbit the sun in the same direction, the closer to the sun, the quicker the planet moves
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