Do new moons exist?

According to the Word of Yahweh, of course they do. Following is a sample:

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 Elohim: I am יהוה [Yahweh] your Elohim [god]. Numbers 10:10

Then Jonathan said to David, To morrow is the new moon: and thou shalt be missed, because thy seat will be empty. 1 Samuel 20:18

And he said, Wherefore wilt thou go to him to day? it is neither new moon, nor sabbath. And she said, It shall be well. 2 Kings 4:23

And to offer all burnt sacrifices unto יהוה in the Sabbaths, in the new moons, and on the set feasts, by number, according to the order commanded unto them, continually before יהוה. 1Chronicles 23:31

Behold, I build an house to the name of יהוה my Elohim, to dedicate it to him, and to burn before him sweet incense, and for the continual shewbread, and for the burnt offerings morning and evening, on the Sabbaths, and on the new moons, and on the solemn feasts of יהוה our Elohim. This is an ordinance for ever to Israel. 2 Chronicles 2:4

Even after a certain rate every day, offering according to the commandment of Moses, on the Sabbaths, and on the new moons, and on the solemn feasts, three times in the year, even in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles. 2 Chronicles 8:13

And afterward offered the continual burnt offering, both of the new moons, and of all the set feasts of יהוה that were consecrated, and of every one that willingly offered a freewill offering unto יהוה. Ezra 3:5

Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day. Psalms 81:3

There is no doubt of their existence.


What are New Moons

New moon days are special "empty", transitional days, not belonging to any week. After the last Sabbath of every month there will be one or two new moon days, then the month (moon) starts. Without new moon days, months would shift from the moon phases. They are required to keep the months synchronized with the moon phases.


The New moon structure is:

1,2,3,4,5,6,7
1,2,3,4,5,6,7
1,2,3,4,5,6,7
1,2,3,4,5,6,7
New moon day(s)
1,2,3,4,5,6,7
1,2,3,4,5,6,7
1,2,3,4,5,6,7
1,2,3,4,5,6,7
New moon day(s)
...continuing forever

Each group of four full weeks make a full month followed by one or two new moons days.


New Moons are Holy

New moon days are not seventh day Sabbath days of the fourth commandment, but they are holy sabbath days. The temple doors were to be shut the six working days of the week, but open on the Sabbath days and open on the new moon days (new moons). If new moons were not kept holy, there would be more than seven days between the last Sabbath of the previous month and the first Sabbath of the next month.

Thus saith the Sovereign יהוה [Yahweh]; The gate of the inner court that looketh toward the east shall be shut the six working days; but on the sabbath it shall be opened, and in the day of the new moon it shall be opened. Ezekiel 46:1

Yahweh's backsliding people knew that they weren't supposed to buy and sell on the Sabbath nor on the new moon days. They were both holy days.

Saying, When will the new moon be gone, that we may sell corn? and the sabbath, that we may set forth wheat, making the ephah small, and the shekel great, and falsifying the balances by deceit? Amos 8:5


Are they still valid and required?

Some preach that new moon days were "nailed to the cross" or no longer binding or only for the Jews. (See What was nailed to the cross?). Some use Colossians to claim they aren't binding, but if that were true, they would have to admit that the Sabbath also isn't binding because it occurs three words later in the same text:

Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days: Colossians 2:16

This text is about judging men and being judged by men, not worship or right doing (see Romans 14). Most of the same people making the claim about the new moons will still judge you (wrongly) about what you eat and drink and Sabbath keeping. They use this verse to preach against new moon days only. It shows their hypocrisy.

However, If the new moons were actually eliminated, they will be restored (along with Sabbath days) and re-instituted to celebrate forever (proving that neither were ever really "done away with"). In the earth made new we will worship Yahweh on the new moons and on the Sabbath days.

For as the new heavens and the new earth, which I will make, shall remain before me, saith יהוה [Yahweh], so shall your seed and your name remain. And it shall come to pass, that from one new moon to another, and from one Sabbath to another, shall all flesh come to worship before me, saith יהוה [Yahweh]. Isaiah 66:22-23

Some people claim that the Sabbath is based on perpetually repeating weeks, 1,2,3,4,5,6,7 ad infinitum, meaning we no longer need new moons, but new moons and perpetual days cannot co-exist. (see 1,2,3,4,5,6,7 or New Moons).


When Were New Moons Instituted?

And Elohim said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years: And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so. And Elohim made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also. And Elohim set them in the firmament of the heaven to give light upon the earth, And to rule over the day and over the night, and to divide the light from the darkness: and Elohim saw that it was good. Genesis 1:14-18

The start of weekly and monthly cycles were part of creation week. Every month has always started with a new moon (until the Roman counterfeit calendar). There is little doubt that the lunar phases have continued since creation but the timing may have changed. The first Biblical record of a new moon was recorded by Moses (Exodus 12:2, Numbers 10:10). Moses also proved their existence which can be seen by carefully studying the dates (days of the week) of multiple Sabbaths during the wilderness travel. These dates would be impossible without new moon days. The following Psalms also says that it began at creation.

He made the moon for seasons; the sun knows its going down. Psalms 104:19 [Green's literal translation] In 1 Samuel 20:5,6, the story is told as if everyone always knew, "of course, it was the time of the new moon feast".

Some people conjecture that some catastrophe changed the heavens so that new moon days had to be added some time after creation. It's more likely that they were so common and well known since creation that their writing would have been superfluous. (like Moses writing some law stating that a day started with dawn or that the 2nd day followed the 1st day - see below). Even though we don't precisely know, we do know that they existed and are required to keep the moon phases in line with lunar time.


Summary

New moon days are Biblical, Holy, required, transition days that bridge the gap between months. They make the transition from one month to the next. If new moon days weren't Holy, there would be more than seven days between worship days. Without the physical insertion of the new moon day(s), months and weeks would get out of synchronization with the moon phases. New moons have always been part of Yahweh's plan.


For further study see the following Jewish sources - note Jewish tradition has accepted some changes (errors) so compare several sources and the Bible:

The months in the Sacred calendar are established as lunar months. Therefore the sighting of the new moon was ordained to establish the beginning of the monthly cycle and therefore the first day of the month. The moon's full cycle of illumination averages 29.53059 days. Thus we have our biblical months of either 29 or 30 days. The Sanhedrin, which was the council of elders in Israel, would confirm the sighting of the new moon based upon reliable witnesses and shofars were blown in accordance with the scripture to announce the beginning of the month. Today, the rabbinical calendar is based on calculations set up by Rabbi Hillel the second in the mid fourth century. Around this time, the Sanhedrin (the high court of ancient Israel) ceased to exist. Hillel felt that the New Moon could not be declared visually without a Sanhedrin to affirm its sighting, so he decided it must be calculated. Rabbis now know that Hillel's calculations were/are off, sometimes as much as two days, which means the festivals are not celebrated on the correct day. But they have decided to wait until a Sanhedrin is established again to change it. See Hebrew Roots

The Rabbanite Midrash relates that when God said to Moses "This month (HODESH) shall be for you the beginning of months" (Ex 12,2) the Almighty pointed up into the heavens at the crescent New Moon and said "When you see like this, sanctify! [=declare New Moon day]". This Rabbinic fairy-tale highlights an important point, namely that the Bible never comes out and says we should determine the beginning of months based on the New Moon. The reason for this is that the term for "Month" (Hodesh) itself implies that the month begins with the crescent New Moon. As will be seen, this would have been obvious to any ancient Israelite present when Moses recited the prophecies of Yehovah to the Children of Israel and therefore there was no need to elucidate this concept any more than such terms as "light" or "dark". However, due to the long exile, we have lost the use of Biblical Hebrew in day to day speech. Therefore, we will have to reconstruct the meaning of Hodesh from the usage of the word in the Biblical text using sound linguistic principles. See The New Moon in the Hebrew Bible

Even today, Jews in Israel are sighting the new moons. See When is the New Moon