| D = | 295 |
| Jan. | 31 |
| Feb. | 29 |
| Mch. | 31 |
| April | 30 |
| May | 31 |
| June | 30 |
| July | 31 |
| Aug. | 31 |
| Sept. | 30 |
| Oct. | 21 |
| q | = | 306 | ||
| r | = | 6 | = Friday. | |
| Y | = | 1492 | ||
| + D | = | + 295 | ||
| + (Y - 1) ÷ | 4 | = | + 372 | |
| - (Y - 1) ÷ | 100 | = | - 14 | |
| + (Y - 1) ÷ | 400 | = | + 3 | |
| 7 ) 2148 |
Find from some history the day of the week on which Columbus first saw America, and compare this with the above.
On what day of the week did last Christmas fall? On what day of the week were you born? In the formula for the day of the week why does q have the coefficient 7? What principles in the calendar give rise to the divisors 4, 100, 400?
For much curious and interesting information about methods of reckoning the lapse of time the student may consult the articles Calendar and Chronology in any good encyclopædia.
