Psalms 81:3

Blow in the New Moon the ram's horn, ba-kesah (fully covered-clothed-concealed), in day designated.

See also http://sda-online.com/psalm_118.htm for New Moon Day determination by "The Plummet"

Rabbi Shmuel interpretes "chageinu" as "designated".

There is only one subject, New moon. To have two subjects there would be a "vav" used as "and".

Blow in the New Moon the ram's horn, (no "and") ba-kesah, in day designated.

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H2282

chag cha^g

khag, khawg

A festival, or a victim therefor: - (solemn) feast (day), sacrifice, solemnity.

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An important Document From Rabbi Shmuel - RH DAY 1: Word document, explains about the "bakeseh" and "chageinu" means "designated".

Book of Enoch 78 On the side whence the light of the moon comes forth, there again she wanes till all the light vanishes and all the days of the month are at an end, and her circumference is empty, void of light.

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.

Numbers 10:2
2 Make thee two trumpets of silver; of a whole piece shalt thou make them: that thou mayest use them for the calling of the assembly, and for the journeying of the camps.

Isaiah 1:13, 14 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 echad (one-first) 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 7:20

19 For the goodman [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 day appointed (#3677).

The Holy Name Bible has "New-Moon" for 3677 (kesah).

The Holy Name Bible: Proverbs 7:19, 20

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.

The New Moon day is a unique day, it is the only day, and also the "extra" day in a 30 day moon, that stands outside of the weekly cycles of time.

The New Moon day has no light on the moon. The Spirit "hovered" on the New Moon day, before the creation of "Light".

He created "Light" on the first day of the weekly cycle.

Hence the New Moon Day before Creation Week started, was a "dark" conjunctive moon.  It seems natural that He would begin work on the 2nd day of the moon after the New Moon pause day which stands outside of the weekly cycle.

The 4th quarter Shabat is different from the first three that are half, full, half illuminations, as the 4th is but a sliver crescent moon, immediately preceeding the New Moon day-s.

John 9:4
4 I must work the works of Him that sent Me, while it is day: the night cometh, when no man can work.

The six working days, all have light.

The New Moon day has no light on the moon, while conjunctive. The 7th New Moon is commanded "no servile work"

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

H7218
ro^'sh
roshe
From an unused root apparently meaning to shake; the head (as most easily shaken), whether literally or figuratively (in many applications, of place, time, rank, etc.): - band, beginning, captain, chapiter, chief (-est place, man, things), company, end, X every [man], excellent, first, forefront, ([be-]) head, height, (on) high (-est part, [priest]), X lead, X poor, principal, ruler, sum, top.


Exodus 12:2
2 This month [shall be] unto you the beginning(rosh) of months: it [shall be] the first month of the year to you.

Numbers 10:10
10 Also in the day of your gladness, and in your solemn days, and in the beginnings(rosh) of your months, ye shall blow with the trumpets over your burnt offerings, and over the sacrifices of your peace offerings; that they may be to you for a memorial before your Elohim: I [am] YHVH your Elohim.

Numbers 28:11
11 And in the beginnings(rosh) of your months ye shall offer a burnt offering unto YHVH; two young bullocks, and one ram, seven lambs of the first year without spot;

1 Chronicles 27:3
3 Of the children of Perez [was] the chief(rosh) of all the captains of the host for the first month.

1 Chronicles 27:5
5 The third captain of the host for the third month [was] Benaiah the son of Jehoiada, a chief(rosh) priest: and in his course [were] twenty and four thousand.

Jeremiah 52:31
31 ¶ And it came to pass in the seven and thirtieth year of the captivity of Jehoiachin king of Judah, in the twelfth month, in the five and twentieth [day] of the month, [that] Evilmerodach king of Babylon in the [first] year of his reign lifted up the head(rosh) of Jehoiachin king of Judah, and brought him forth out of prison,

Ezekiel 40:1
1 ¶ In the five and twentieth year of our captivity, in the beginning(rosh) of the year, in the tenth [day] of the month, in the fourteenth year after that the city was smitten, in the selfsame day the hand of YHVH was upon me, and brought me thither.

Zechariah 3:5
5 And I said, Let them set a fair mitre upon his head. So they set a fair mitre upon his head(rosh), and clothed him with garments. And the angel of YHVH stood by.

Zechariah 4:2
2 And said unto me, What seest thou? And I said, I have looked, and behold a candlestick all [of] gold, with a bowl upon the top of it, and his seven lamps thereon, and seven pipes to the seven lamps, which [are] upon the top(rosh) thereof: