AN

INTRODUCTION

TO THE

USE of the GLOBES,

AND THE

ORRERY:

ALSO,

The Application of Aftronomy to Chronology;

In which are contained

RULES and MEMORIAL CANONS for finding the
Dominical Letter, Leap-Year, Epact, Easter, &c. ac-
cording to the Gregorian Account or New Style; with
an Explication of the Reason of each Rule.

Adapted to

The INSTRUCTION and ENTERTAINMENT of
fuch Persons as are not previously versed in Mathe-
matic Science.

WITHAN

APPENDIX,

Attempting to explain the Account of the First and Fourth
Days Work of CREATION in the First Chapter of Genesis.

By DAVID JENNINGS, D. D.

THE THIRD EDITION.

LONDON:

Printed for J. NOURSE in the Strand, Bookseller in Ordinary
to his MAJESTY ; J. BUCKLAND, in Pater-nofter Rous,
near St. Paul's; and E. and C. DILLY, in the Poultry.

MDCCLXVI.

QB 66

1554

1766

Nest, Sci. Fayl 1-27-27 14277

THE

PREFACE.

**HE Persons for whose Sake and

******

T Ufe the following Treatife was at first drawn up, (or rather I should say, as to the greater Part

***

of it, this Collection made out of many other and larger Books) are chiefly such, who, though they have not the Opportunity of attending to the more abstruse Parts of Mathematic Science, are defirous at least, of some general Knowledge in these Matters; such who, though Providence has marked out their Tract of Life amidst Scenes of worldly Business, yet have Souls large enough to extend themselves, now and then, beyond this little Planet, and take a distant View of more remote Worlds; in the Contemplation of which, both the philosophic and pious Mind may find Entertainment and Profit. The Works of the Lord are great, Jought

A 2