Rosh Chodesh is the day that the new moon appears in the sky, beginning its 29 1/2-day cycle 
(Rosh Chodesh; is; the day that the new moon appears in the sky,) (the new moon; appears; L:in the sky; T:the day)
Rosh Chodesh the new moon
is appears
the day that the new moon appears in the sky,
L:in the sky T:the day