'New Moon' in the Bible

And David said to Jonathan, Tomorrow is the new moon, and I will not be seated with the king at his table: but let me go to a safe place in the country till the evening.

Then Jonathan said to him, Tomorrow is the new moon: and it will be seen that you are not present, for there will be no one in your seat.

So David went to a secret place in the country: and when the new moon came, the king took his place at the feast.

And on the day after the new moon, that is, the second day, there was still no one in David's seat: and Saul said to his son Jonathan, Why has the son of Jesse not come to the feast yesterday or today?