The Keter and Da'at Calendars

At the summit stands the Keter calendar. It is defined by

public static Gauss gauss(int year, int n) {
return new Gauss (year, n, 642 + ((int) ((10 + n - (10 + n) % 19)/19) - ((10 + n >=0)?0:1))*1080*12);
}

This is the bravest choice. It keeps the 642 Chalakim of Ben Meir and adds to it the z/2 term that we know from the new Hebrew calendar. Of course, I made a Keter app for you. The Keter calendar also synchronizes on 1 Tishrei of year 1., as we saw for the other calendars. The Molad of Tishrei of the year 1 is at day ב, at ט"ז hours and 642 Chalakim. The Molad Nissan of year 1 is at day ו, at ט hours, and 793 Chalakim.

Then there is the Da'at calendar, defined by

public static Gauss gauss(int year, int n) {
return new Gauss (year, n, - 642 + ((int) ((10 + n - (10 + n) % 19)/19) - ((10 + n >=0)?0:1))*1080*12);
}

This is the least ambitious choice of the upper realm. It has the 642 term with the opposite sign. The Da'at calendar also synchronizes on 1 Tishrei of the year 1. The Molad of Tishrei is at day ב, at י"ז hours and 846 Chalakim. and Molad Nissan is at day ו, at י hours, and 997 Chalakim. At Da'at stands the ladder with its top in the Heavens. Of course, I made a Da'at app for you. We note that the new Hebrew calendar is on the middle path.

כִּי שִׁבְעָתַיִם, יֻקַּם-קָיִן; וְלֶמֶךְ, שִׁבְעִים וְשִׁבְעָה

{Bereshit 4:24}