Just answer one question. Are you aware that the Feast of Unleavened Bread (the 15th) takes place on the full moon of Nisan and follows the Passover (the 14th), the previous day?
When you give me your answer to this simple request for clarification....we'll continue.
Well I guess we will agree not to continue, but the third day was still Sunday.
Could you please cite the Scripture that instructs the moon having anything to do with the date of the Feast/Passover? It is the 'spring equinox' that marks the beginning of the month. The moon is just not reliable, whereas the spring equinox is.