(573)
When 1. 9. 3. to the Year hath added been,
Divide by 19. 28, fifteen.
The Remainders are the Numbers sought. And hereby We found them for the year 1668. in the former Example
The use of the Prime is, to find the Epact, and thereby the Moons Age, time of High Water, &c.
A farther use of the Suns Cycle is, to attain the Dominical Letter, and thereby to know the Day of the Week, on which any Day of the Month happens. But this is more easily and with less caution obtain'd, by finding on what Day of the Week the first of March happens for ever, according to such Rules and Verses as I have elsewhere published. In brief thus:
| To the Number | 2. |
| Add the Year of our Lord, suppose | 1669. |
| And its even 4th part, neglecting what remains, if any | 417. |
| The Sum | 2088. |
Divide by 7, noting the Remainder, which shews the Number of the Day of the Week, accounting Sunday first. If 0 remain, the first of March falls on a Saturday. In this Example there remains 2, shewing the first of March to fall on Monday.
If it were required to perform this for years preceding our Saviour's Nativity, then take this Rule:
To the Year add its even fourth part, the Sum divide by 7, the Remainder shews the Day of the Week, accounting Sunday first, Saturday second, and so backward.
PROBLEM.
To find what day of the Month in the first Week of each Month, happens to be on the same day of the Week as the first of March.
Use the (plain) following Verses, in which the twelve Words relate to the twelve Months of the Year, accounting March the first:
- Ask endless Comfort, God enough bestows,
- From Divine Axioms Faith confirmed grows.
