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CH A P. I.

Spherical Trigonometry applied to Astro

nomy; in all the Practical Problems of the Sun, Moon, and Stars, which depend on the Solution of Spherical Tri. angles.

N Part 2, of Vol. 1, I applied the Doctrine of
Plain Trigonometry to the Purposes of Astronomy

in a great Variety of Problems, far exceeding any Thing of that Kind yet done in Books of this Subject; the same Thing I shall here endeavour, aiming to give the young Learner not only a compleat Idea of the Art, but also of the Excellency and Extensiveness of its Use in the Arts and Sciences, among which Astronomy is the chief:

In order to perform Conclusions of Astronomy, we must be able to find the true Place of the Sun in the Ecliptic ; the Latitude of the Place ; and the greatest Declination of the Sun (or the Sun's Orbit, the Ecliptic ) from the Equinoctial, for any given Moment of Time.

As for the Sun's Place, that is most conveniently had from the Astronomical Tables, which are calculated from just Observation, and gives the Mean or Middle Motion of the Sun for any Part of Time ; such Tables I have here adjoin’d.

;

A TABLE

A TABLE of the Sun's Mean Motion.

Years.

Mean Motion of

the Sun.

Mean Motion

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A TABLE of the Sun's Mean Motion.

April.

May.

June.

M. Mo. of Sun.

Days. i

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A TABLE of the Sun's Mean Motion.

July.

Auguft.

September.

Days.]

M. Mo. of Sun.

M.P.

M. Mo. of Sun.

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8 27 06 37 37 (29 6 26 59 09 29 7 27 32 271331 8 28 05 4537 30 6 27 58 17 29 7 28 31 3633 8 29 04 5437 31 6 28 57_2529 7 29 30 44133) VOL. II.

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