The above writing in white is true regardless of whether or not someone sees the cresent moon after that sunset. For some days are cloudy, while on others the moon is still too close to the sun and so one is not able to see it because how bright the sunlight is even though dusk might be transpiring.
Numbers 28
11 On the first of every month, present to the LORD a burnt offering of two young bulls, one ram
and seven male lambs a year old, all without defect.
12 With each bull there is to be a grain offering of three-tenths of an ephah [d] of fine flour mixed
with oil; with the ram, a grain offering of two-tenths of an ephah of fine flour mixed with oil;
13 and with each lamb, a grain offering of a tenth of an ephah of fine flour mixed with oil. This is
for a burnt offering, a pleasing aroma, an offering made to Yehowah by fire.
14 With each bull there is to be a drink offering of half a hin of wine; with the ram, a third of a hin;
and with each lamb, a quarter of a hin. This is the monthly burnt offering to be made at each
new moon during the year.
15 Besides the regular burnt offering with its drink offering, one male goat is to be presented
to the LORD as a sin offering. (This, v.15, is no longer in effect, since Yehoshua's death for us.)
And you must not conduct business that day according to Yehowah through the prophet Amos
in Amos 8. For there you can see that Yehowah was angry at the people of Israel for them wanting to
conduct business on Rosh Chodesh:
Amos 8
2 Yehowah said to me, "The time is ripe for my people Israel; I will spare them no longer.
3 "In that day," declares the Adonai Elohim, "the songs in the temple will turn to wailing.
Many, many bodies—flung everywhere! Silence!"
4 Hear this, you who trample the needy
and do away with the poor of the land,
5 saying,
"When will the New Moon be over
that we may sell grain,
and the Sabbath be ended
that we may market wheat?"—
skimping the measure,
boosting the price
and cheating with dishonest scales,
6 buying the poor with silver
and the needy for a pair of sandals,
selling even the sweepings with the wheat.
7 Yehowah has sworn by the Pride of Jacob:
"I will never forget anything they have done."
PSALM 81:3
Blow the shofar at the time of the New Moon,
At the full moon, on our solemn feast day.
Numbers 10
2 Make thee two trumpets of silver; of a whole piece
shalt thou make them: that thou mayest use them....
10 Also in the day of your gladness, and in your solemn
days, and in the beginnings 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 God: I [am]
Yehowah your God.
