Some words that can be made from the letters in 'celestial' are: a ace, aces act, acts ail, ails aisle ait, aits ale, ales alee alit all allies alt, alts as at ate call, calls callee, callees case...
The celestial equator and the ecliptic are two "great circles" on the sky coordinate system. Think of them as two hoops of the same size, hinged together at two points. If you hold one steady and...