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  1. ... In the sky, a meridian is an imaginary great circle on the celestial sphere . It passes through the north point on the horizon, through the celestial pole...

  2. ...the given diagram that the ecliptic (which maks the path of the sun on the celestial sphere ) is inclined at an angle of 23.5 degrees with the earth equatorial...

  3. ...quot; originates from the hazy band of white light appearing across the celestial sphere visible from Earth, which comprises stars and other material...

  4. ...reason for the very existence of the earth, the sun, and other celestial bodies; without it, matter would not have coalesced...to move towards their proper place in the crystalline spheres of the heavens, and that physical bodies...