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IF YOV desyre at any tyme to knowe how olde the Moone is. Firste consider what day of the Month it is that you wold knowe the age of the Moone. And then know what nōber the Epact is that yere,
and put them together, then accompt how many Monthes the same is frō the Month of Marche, and recon Marche for one, and then put all together, and se what nomber that maketh. If the nomber be more then 30. take out the 30. and looke what resteth and so many daies olde the Mone is: But if it be iust 30. then you maye be sure that the same day the Mone chaunged, or was the first daie of the Mone. And if the nom∣ber be lesse then. 30. what so euer it be, so many daies olde is the Mone. And for the better vnderstanding hereof, I will geue you an example or twayne.
I wolde knowe the .xv. day of Decem∣ber next cōming 1571. how olde the Moone wilbe. First I haue in memory this nom∣ber .xv. and streyght I put thereunto the nomber of the Epact this yere which is 4. and that maketh. 19. then I put so manye Monthes thereunto as is from Marche to December and recon Marche for the first, and December for the laste, and they are x. the whiche I put to my aforesayd nom∣ber 19. which in the whole maketh 29. and
so many dayes olde shall the Mone be the 15. daye of December next.
ANOTHER example, I wold know the 19. daye of September next comminge 1571. how old the Mone shalbe: First I put in Memory 19. which is the day I aske the question of, and I put therunto the Epact of this yere whiche is 4. and that maketh 23. and thereunto I put so many Monthes as is from Marche to September and re∣ken Marche for one, as I dyd in the laste example, and that is 7. Monthes, whiche nombers beinge put altogether make. 30. and that day the Mone changeth or is the fyrst day of ye Mone. And thus of al other.
The yere when there is no Epact, which as you may perceiue by the former Table chaunceth euery xxx. yere, then alwayes that yere the Mone changeth the first day of Marche. And all that yere you shall re∣ken for the age of the Mone the day of the Month, and so many Monthes as is from Marche, and that is the age of the Moone for that yere.
Nowe when you know the chaunge of the Mone, put thereunto. 7. and there be∣ginneth the fyrst quarter, and the. 15. daye
is full Mone, and. 7. daies more beginneth the last quarter. And thus ye may readely and quickelye reken vppon your fingers, and finde the newe Mone, full Mone, and the age of the Mone at any time for euer.
And when you haue the former rule in perfecte memorye, then maye you at any time, tell when it is full sea, or lowe wa∣ter, namely here in the ryuer of Thames at London bridge, as thus. Knowe for a certaintie that euery change of the Mone, and euery full Mone maketh a hyghe wa∣ter or full sea at London Bridge at iij. of the clocke eyther in the mornyng or at af∣ter none, and then may you reken so ma∣ny daies from the change to the ful Mone whiche is. 15. dayes, and accompt the tide to encreace euery daye one houre, whiche is xv. houres, and then abate xv quarters, for in a daye are two tydes, a flood and an Ebbe, & they bothe alter scant iij. quar∣ters of an houre, except stormes and tem∣pestes cause the contrary, and so you may from daye to daye where so euer you are, knowe the certeintie of the tyde at Lōdon Bridge. And the better to leade you vnto the vnderstanding herof, take this exāple.
I would know the xij. of Septēber next 1571. at what tyme it shalbe high water at London Bridge. First I resort to my for∣mer rule, and serche how many dayes old the Moone wyll be that day, & I finde that the Moone shalbe 23. dayes olde, and then I consider that the 15. daye, whiche day the Moone was at the ful, it was highe water at 3. of the clock, then for viij. dayes more, I adde for euery daye thre quarters of an houre, and that is vj houres, which I put to 3. of the clock, and that maketh 9. of the clock, at whiche houre shalbe a highe wa∣ter, and then tell from ix. of the clock, vij. houres more, & that maketh iiij. of the clock, and then shal it be a dead lowe water, and thus of all other for euer.