Our holy calendar is oriented completely by the vernal equinox (Enoch 82:15) (Jubilees 2:9), just as our days start at sunrise. For better or worse, the center of the earth is Jerusalem, so vernal equinox must be confirmed at solar noon on a sundial there. Fortunately these readings are very regular and can be easily calculated or looked up for however many years into the future or past required.
Quite simply, our calendar's new year's is on the day after this equinox reading. Interestingly, the same sundial will give you the autumn equinox, the same reading/prediction of timedanddate.com. Therefore, anyone with internet access can get this date for any year. There's usually one day only (the 365th, not counted on enocal, Job's birthday), but seemingly at the same frequency and timing as gregorian, there will be another day to wait (leap year). There is a moon sign for this (Enoch 73:13) but it is not necessary. (The idea of leap years ever adding a full week has never been confirmed in scripture.) The sundial method is so easy that you can literally put a stick in a disk to read it, and essenes actually did this, so we think adheres to a simplicity/comrehensibility principle deducted from Genesis 1:14 and Romans 3:4. Together with numbers for days and months, there is a clear logic from enocal that the sanhedrin/institutions of man are to never be put above God (or even nature).
Deus, God in Latin: Day, God in English. Dio, God in Italian: Dì, day in Italian. God is light. The sun is the good, positive light that warms. The moon is the night (evil, negative, feminine, passive etc.) light which cools and spoils. The moon cannot be the organizing principle of our calendar, but it is legitimate as a sign (Rev 12:1). The moon displays definite patterns over long stretches of years and is synchronized by enocal, but it's not related to our vernal equinox reading.
The moon brings on all the years exactly, that their stations may come neither too forwards nor too backwards a single day; but that the years may be changed with correct precision in three hundred and sixty-four days. In three years the days are one thousand and ninety-two; in five years they are one thousand eight hundred and twenty; and in eight years two thousand nine hundred and twelve days. (Enoch 73: 13)
Full moons appear on and around vernal equinox in certain patterns, and ancients could have used a list of these events to confirm their equinox readings and change them by one day if necessary. This passage could also possibly referring to an amazing jubilee calendarwhich syncs up perfectly with the sun.
Last day of the year:
What's the last day of the year?
When does a day start?
Texts of Michael Heiser's context, linguistics, archeology and translation issues surrounding the bible
Biblical analysis by William Finck which shows that Israelites equal Whites
200 Proofs the Earth is flat (and the bible is right), by Eric Dubay