The moon
yareach (yaw-ray'-akh)
the moon -- moon. Yrechow.
and stars
kowkab (ko-kawb')
a star (as round or as shining); figuratively, a prince -- star(-gazer).
to rule
memshalah (mem-shaw-law')
rule; also (concretely in plural) a realm or a ruler -- dominion, government, power, to rule.
by night
layil (lah'-yil)
a twist (away of the light), i.e. night; figuratively, adversity -- (mid-)night (season).
for his mercy
checed (kheh'-sed)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty
endureth for ever
`owlam (o-lawm')
concealed, i.e. the vanishing point; generally, time out of mind (past or future), i.e. (practically) eternity; frequentatively, adverbial (especially with prepositional prefix) always