Going back to my first question - 'relates to the movement or path of a celestial object' (answered YESish) and assuming that your last answer excludes all man-made celestial objects.
Is the anwer the name or description of that path?

Raak] Is it the intersection of two or more things? You could at a pinch define it like that, but it wouldn't be very helpful.
Kim - Is it visible with the naked eye? Bearing in mind the earlier qualification of 'observable', yes.
Chalky - A light year - or ... a parsec? Inside the solar system? However, a modicum of *applause* for these having something in common with the answer.

INJ] Good question, but no (and your assumption is correct)

Raak] An Astronomical Unit? No
Rosie] The rising or setting of some astronomical body? *applause and some cheering* Related to, yes.
Quendalon - Kepler's laws of planetary motion? No
ImNotJohn - Is it related to navigation? No