The Sabbath is a day; just as if the New moon is a day and all days are days, but not all days are ordinary days because some are special days. Father YHWH instructs us which days are special and uses the moon for signs (beacons) to let us know which are the special days (seasons or Appointments) (Gen 1:14)

Someone said the Sabbath day Appointment was not included in Gen 1:14 as one of the days for the Great lights. “Sun, moon, and stars shall be for beacons of the Appointments” Some might think it should say all appointments except Sabbath appointments. The fact is the weekly Sabbath was the only Appointment at that time; it was years later when they were delivered from Egypt’s bondage (on the 15th Sabbath.) And they were commanded to keep the Sabbath day (15th) in the 1st month because they were delivered from Egypt bondage on the 15th day of the 1st month. (Deut. 5:15and Num. 33:3) It was a feast for seven days.
In Philo’s writings, he records that this feast alone with the Feast of Tabernacles, which begins on the 15th Sabbath were assigned to the weekly Sabbath day. (15th) Philo knew the 15th was a weekly Sabbath day, which began both of these Feasts of YHWH, which lasts seven days. See Philo page 532 xxx(161) Philo knew they were given rest on the 15th from Egypt’s bondage and the Feast in the 1st and 7th months have to do with their deliverance form Egypt’s bondage on the 15th, a Sabbath and these two feast were assigned to the weekly 7th day. (15th) These are memorial days, which began these two festival weeks. (see article on Philo and the Sabbath)

I mention Philo here; although we know, that he is not scripture he, he was a very respectable Jew that lived among the Jewish people, and even led a delegate to Rome in behalf of the Jewish people, at the time of the Messiah. I hope to add a history chapter later with Encyclopedia reference, and ancient calendars, etc.

Although, Philo never came right out and said the seventh day is by the moon and is counted from the New Moon; he had no need to, especially if it was common knowledge at this time, but he did say the fourth commandment has reference to the sacred seventh day, that it may be passed in a sacred and holy manner. Now, some states keep the holy festival only once in the month, counting from the New Moon, as a day sacred to YHWH: but the nation of the Jews keep every seventh day regularly, after each interval of six workdays.” (Counting from the New Moon). Philo page 526 xx (96).
He seems to emphasize only once instead of more (four times) each month. At least counting from the New Moon for the Sabbath is nothing new. Again, Philo mentions the moon with the seventh day. On page 26 (iv) (8) “Again, the periodical changes of the moon, takes place according to the number seven, that star having the greatest sympathy with the things on Earth. And the changes which the moon works in the air, it perfects chiefly in accordance with its own configurations on each seventh day.” If Philo, which lived before during and twenty years after the time of the Messiah, is saying what I believe he is saying; it is not out of harmony with the Scriptures or other history which I am working on now and will add later.

Philo states that the two festivals, (Unleavened bread and Tabernacles) which last seven days are assigned to the weekly seventh day (both began on the 15th) and Philo knew Deut. 5:15 teaches to remember the Sabbath day because they were delivered from Egypt’s bondage on the weekly Sabbath day (15th) Deut. 5:15 and Num. 33:3. See also Philo page 532 xxx (161) and page 15 xxxiv (101) for more about the phases of the moon.

All days that He designates as worship days are Appointment days, and are special days, not ordinary days. The New moon day, every month, is a worship day (Appointment). (Ez. 46:2, Isa. 66:23, Num. 10:1-10, Num. 28:11-14, Num. 29:1, Amos 8:5) Every New moon (month) is positively a worship day appointment (special day) and it is by the Word of YHWH in this world and the world to come, and all flesh will worship Him on this day, and not off somewhere working. (Isa.66:23)

You will know when the special days come, by watching the moon not man’s calendar. The New moon day was, and is a special worship day, therefore you must use the moon to find and keep it. The same is true for the four weekly Sabbaths of each moon. Nowhere does the Scriptures teach that any of the next six days after the New moons are Appointments, but they are ordinary workdays. Now, the Scriptures does say that after six workdays we are to rest, as He did, and it is an Appointment of worship, the same as with the New moon day. All appointment days, whether New moon, Sabbaths, Day of Atonement, and the twenty-first day in the first month, are equal Appointments for worship.
Sabbath means intermission and He chose to place one on the tenth day of the seventh moon and calls it a Sabbath. Others, He calls Sabbatones, but they have the same meaning as Sabbath—from the word means intermission. (See concordance) Weekly Sabbaths are called Sabbatones also (Lev. 23:3, Ex. 31:15, Ex. 16:23 - look up the word rest in these verses.)