Genesis 1:14 And Elohim said, Let the lights in the firmament of the heavens separate the day from the night; and they will be for signs-(226-owth), and for seasons-(4150-moed-appointments), and for days, and years: Strong's #226 'owth, oth; prob. from 225 (in the sense of appearing); a signal (lit. or fig.), as a flag, beacon, monument, omen, prodigy, evidence, etc.:--mark, miracle, (en-) sign, token.

Psalms 104:19 He appointeth the moon for seasons-4150 (moed-appointment times of congregation): the sun knoweth his going down

Daniel 8:10
10 And it waxed great, [even] to the host of heaven; and it cast down [some] of the host and of the stars to the ground, and stamped upon them.

Note: "The host of heaven" in Daniel 8:10 are not the heavenly angels unfallen, but rather in particular, the "Moon" is the main clockworks, that has been removed from Heaven's ordained "keepers of time"

To worship Him as Creator, in the Three angels messages, "Worship Him that made ..." we respect and worship on His appointed times, not Romes appointed times.

Rev. 12:1- And there appeared a great wonder in heaven; a woman clothed with the sun, and the moon under her feet, and upon her head a crown of twelve stars.

With the moon removed, we have not the possibility to keep "His Sabbaths" and "His New Moons"