The rule itself is given, and fully explained in [Part Second, Chapter V], (q. v.) but cannot be applied to the 37 years without some correction. In all the months marked with a star, events fall one day later in the week than that which is indicated by the rule. This should be borne in mind, and make the event one day later in the week than that which is found by the rule. For example, Julius Cæsar was assassinated on the 15th of March, 44 B. C. By giving to February 28 days the first day of March would fall on Wednesday, and, of course, the 15th would be Wednesday. But Cæsar gave to February 29 days, so that the first day of March fell on Thursday, and the 15th was Thursday.
Hence, every event from March to September will fall one day later in the week than the rule indicates. But the rule is applicable to September, for it will make no difference whether there are 29 days in February or 31 in August, there are the same number of days from February to September. But the 31 days in September will cause all events to fall one day later in the week during the month of October, but they coincide again during the month of November. The order is interrupted again in December by giving 31 days to November. See following table:
| As Arranged by Julius Cæsar. | As Corrected by Augustus, 8 B. C. |
| January, 31 | January, 31 |
| February, 29 | February, 28 |
| March, 31* | March, 31 |
| April, 30* | April, 30 |
| May, 31* | May, 31 |
| June, 30* | June, 30 |
| July, 31* | July, 31 |
| August, 30* | August, 31 |
| September, 31 | September, 30 |
| October, 30* | October, 31 |
| November, 31 | November, 30 |
| December, 30* | December, 31 |
| Dominical Letter. | Year. | Dominical Letter. | Year. | Dominical Letter. | Year. | Dominical Letter. | Year. |
| B. C. | B. C. | A. D. | A. D. | ||||
| cb | 45 | b | 22 | b | 1 | c | 23 |
| a | 44 | ag | 21 | a | 2 | ba | 24 |
| g | 43 | f | 20 | g | 3 | g | 25 |
| f | 42 | e | 19 | fe | 4 | f | 26 |
| ed | 41 | d | 18 | d | 5 | e | 27 |
| c | 40 | cb | 17 | c | 6 | dc | 28 |
| b | 39 | a | 16 | b | 7 | b | 29 |
| a | 38 | g | 15 | ag | 8 | a | 30 |
| gf | 37 | f | 14 | f | 9 | g | 31 |
| e | 36 | ed | 13 | e | 10 | fe | 32 |
| d | 35 | c | 12 | d | 11 | d | 33 |
| c | 34 | b | 11 | cb | 12 | c | 34 |
| ba | 33 | a | 10 | a | 13 | b | 35 |
| g | 32 | gf | 9 | g | 14 | ag | 36 |
| f | 31 | e | 8 | f | 15 | f | 37 |
| e | 30 | d | 7 | ed | 16 | e | 38 |
| dc | 29 | c | 6 | c | 17 | d | 39 |
| b | 28 | ba | 5 | b | 18 | cb | 40 |
| a | 27 | g | 4 | a | 19 | a | 41 |
| g | 26 | f | 3 | gf | 20 | g | 42 |
| fe | 25 | e | 2 | e | 21 | f | 43 |
| d | 24 | dc | 1 | d | 22 | ed | 44 |
| c | 23 | c | 45 |
CYCLES—JULIAN PERIOD—EASTER.
HEBREW CALENDAR.