Yes, ECLIPTIC is a Scrabble word!

Letter values in Scrabble US: E 1, C 3, L 1, I 1, P 3, T 1, I 1, C 3.

Is it a valid word?

ECLIPTIC is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator