Definition of Gibbous
When someone says the moon is gibbous, it means that more than 50% of the moon is illuminated in the sky. This happens when the moon is moving towards a full moon and after the full moon when we are approaching a new moon.
TERM OF THE DAY
An ephemeris is a map of the planets. Because the planets are in constant motion, that map is going to change constantly. Ephemerides come in either midnight or noon versions, and show you where the planets are (or were for a date in the past or will be for a date in the future) at either midnight or noon GMT.Read the full Ephemeris definition