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learning the Practice will be attended with some Advantages; for as the Learner will fee on what particular Theorems each Part of it is founded, he will be the more folicitous of understanding them when Time and Opportunity will permit, and by that means render himself a complete Artist.

As the Accuracy of Tables made Ufe of in Calculation is a Matter of the last Importance, so I have been very careful in correcting those contained in this Treatise; in order to which I not only carefully examined the Copy before it went to the Press, but also re-examined, very attentively, every Sheet before it was printed off; whence I have Reason to hope that they are entirely correct, and, confequently, the Practitioner may fafely rely on them without the least Danger of being deceived.

The

The CONTENT S.

CHAP. Ι.

Elements of Chronology, from Page 1 to Page 13.

T

HE Division of Time and its Parts

What a Solar and Lunar Month is
What a Solar and Lunar Year is

What Bissextile or Leap-year is, and by whom introduced --
What the Gregorian or New-Style is, and wby instituted
What the Dominical Letter is, its Use, and the Method of
finding it.

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2

3

4

ibid

4

5

What the Cycle of the Sun is, and how it may be found-6 What the Metonic Cycle, or Golden Number is, and how

to find it

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Why Easter is often celebrated at a different Time from what
it ought to be according to Astronomical Calculation
What the Epact is, with the Method of finding it ---
How to find the Moon's Age, and Time of her Southing
What the Victorian Period is, and how it may be found
What the Roman Indiction is, and how to find it

7

9 ibid.

--10

II

12

What the great Julian Period is, and the Methodof finding it

13

CHAP. II. Of the Flux and Reflux, or the Flowing and Elbing of the Sea. from page 13 to 21

How to find the Time of High-water on the Full and Change
Days

An Alphabetical Tide-Table of the most remarkable Sea-
Coasts

The Method of finding the Time of High-water any Day of
the Moon's Age

13

14-19

19

The Construction and Use of an Univerfal Tide-Table-20

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