The two preceding detailed year tables can be condensed into simplified ones providing enough information on what kind of calendar needs to be formed for a given year:

REGULAR (NON-LEAP) YEAR TABLE
IF:
The new moon occurs...
THEN:
at or after: but before: This Rosh
Hashanah is
observed on:
and the length
of this year,
in days, is:
Sunday,
3:11:20 a.m.
Monday,
9:32:43+1/3 a.m.
Monday 355
Monday,
9:32:43+1/3 a.m.
Monday,
12:00 noon
Monday 355
AND the previous year
is NOT a leap year
Monday,
9:32:43+1/3 a.m.
Monday,
12:00 noon
Tuesday 354
AND the previous year
is a leap year
Monday,
12:00 noon
Tuesday,
3:11:20 a.m.
Tuesday 354
Tuesday,
3:11:20 a.m.
Thursday,
3:11:20 a.m.
Thursday 354
Thursday,
3:11:20 a.m.
Thursday,
12:00 noon
Thursday 355
Thursday,
12:00 noon
Thursday,
6:22:40 p.m.
Saturday 353
Thursday,
6:22:40 p.m.
Friday,
3:11:20 a.m.
Saturday 353
AND the next year
is a leap year
Thursday,
6:22:40 p.m.
Friday,
3:11:20 a.m.
Saturday 355
AND the next year
is NOT a leap year
Friday,
3:11:20 a.m.
Saturday,
12:00 noon
Saturday 355
Saturday,
12:00 noon
Sunday,
3:11:20 a.m.
Monday 353
TABLE 3a. Summarized molad table for regular years.

 

LEAP YEAR TABLE
IF:
The new moon occurs...
THEN:
at or after: but before: This Rosh
Hashanah is
observed on:
and the length
of this year,
in days, is:
Sunday,
2:27:16+2/3 p.m.
Monday,
12:00 noon
Monday 385
Monday,
12:00 noon
Tuesday,
12:00 noon
Tuesday 384
Tuesday,
12:00 noon
Wednesday,
5:38:36+2/3 a.m.
Thursday 383
Wednesday,
5:38:36+2/3 a.m.
Thursday,
12:00 noon
Thursday 385
Thursday,
12:00 noon
Friday,
2:27:16+2/3 p.m.
Saturday 383
Friday,
2:27:16+2/3 p.m.
Saturday,
12:00 noon
Saturday 385
Saturday,
12:00 noon
Sunday,
2:27:16+2/3 p.m.
Monday 383
TABLE 3b. Summarized molad table for leap years.

The above times are shown, of course, in Western day format.

All that's needed at this point for a given Jewish year is the new moon time corresponding to its Rosh Hashanah (i.e., molad of Tishri) in order to determine its months (and the days of each month).

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