Psalms 81:3

Blow in the New Moon the ram's horn, ba-kesah (covered moon), to day Feast.

Isaiah 1:6, 13, 14 depicts the corruptions brought in, such as "kesah" meaning "full moon" which in Hebrew it does not. It is a lie to throw off the non-jewish ignorant people, about when to declare the day of the new moon. #3677 is a pagan invention to lie and to throw us off from finding His True Worship Days.

Isaiah 1:13, 14
Bring no more vain oblations: incense is an abomination unto Me; the new-moons and sabbaths, the calling of assemblies, I cannot away with, it is iniquity, even the solemn meeting. 14 Your new-moons and your appointed feasts My soul hateth: they are a trouble unto Me; I am weary to bear them.

This text above shows us that He is particular, crescent new moon is pagan, conjunction new moon is the "echad" the "unified" sun-moon-earth, ONE. "and on the 'one' echad day of the moon" This phrase used repeatedly in Scripture is proof, that the first day of the moon, is the "echad" day, and not the next, or next, or even the next day after that.

#3677 Kesah is in
Proverbs 7:19
19 For the goodman [is] not at home, he is gone a long journey:

Proverbs 7:20
20 He hath taken a bag of money with him, [and] will come home at the day appointed (#3677).

The Holy Name Bible has "New-Moon" in place where the deception of Kesah, deceives saying it is full moon.
These are but a few of the many lies and deceptions to deceive the world into a false calendar and hence a false sabbath.

The Holy Name Bible:
Proverbs 7:19
19 For the good-man is not at home, he is gone a long journey:
20 He hath taken a bag of money with him, and will come home at the new-moon festival.

Many times when Scriptures say "in the first day of the month" it is saying "in the echad day of the month. Echad means unity.

http://littleguyintheeye.wordpress.com/?s=twinkling+of+an+eye   The following clip is from this link.

Chad/Echad means unity and is the picture of 2 becoming one. This happens when a man and woman come together and ‘know’ each other. This is connected with the new moon and the sun and moon coming together to become ‘one.’

Maimonides states that: “the new moon is defined as the ‘moment in which the sun and moon, in their uniform motion, become conjoined in a certain part of the sky, which occurs in the same way everywhere in different areas” (Sanctification of the New Moon, Bk 3, trtse. 8, p. 89, ch 6).

http://personal.stevens.edu/~msenator/new_moon.pdf   This PDF states that "Maimonides was a genius"