is a specific kind of: point.

is a broader term that covers: apex, apex of the sun's way, solar apex | antapex | apoapsis, point of apoapsis | node | equinoctial point, equinox | culmination | nadir | periapsis, point of periapsis | celestial pole, pole | zenith | exaltation ... show more.

is a part of: celestial sphere, empyrean, firmament, heavens, sphere, vault of heaven, welkin.