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TO THE SEVENTH EDITION.

The favourable reception which the various editions of this performance have met with from the public has induced the author to undertake an entire revision of every part of the work, and to make such alterations, amendments and additions, as, upon a careful re-consideration of the subject, appeared to be wanting.

Since the time of its first publication, four additional planets, belonging to our system, have been discovered, and many important improvements have been made in several branches of the science; which it became necessary to notice. This has accordingly been done, in a manner which it is hoped will render the work as satisfactory and complete, as the popular plan that was first adopted, will admit.

ROYAL MILITARY ACADEMY, WOOLWICH,

Junc 24, 1816.

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CONTENT S.

LETTER

PAGE

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129

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I. On the Use and Advantage of Astronomy
II. Of the Figure and Motion of the Earth
III. Of the Solar System, and Firmament of the

fixed Stars
IV. Of the Systems of Ptolemy, Tycho Brahe, and

Copernicus
V. Of the System of Descartes
VI. Of the Discoveries of Kepler and Galileo
VII. Of the Newtonian System and Discoveries
VIII. Of the Nature of the Tides
IX. Of the Latitude and Longitude, and the

Methods of discovering them
X. The same subject continued
XI. Of the different Lengths of Days and Nights,

and the Vicissitudes of the Seasons
XIL. Of the Natural and Artificial Divisions of Time
XIII. Of the Equation of Time, or the Difference

between Mean Time and Apparent
XIV. Of the Reformation of the Calendar

XV. Of the Mensuration of the Earth
XVI. The same subject continued .
XVII. Of the Distances and Magnitudes of the Sun,

Moon, and Planets
XVIII. The same subject continued .

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LETTER

PAGE

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312

XIX. Of the Motion, Refraction, and Aberration of

Light
XX. Of the Constellations, and the Phänomena of

the fixed Stars
XXI. Of the Phænomena and Affections of the

Sun, Moon, and Planets
XXII. On Comets, Aeroliths, and Meteors
XXIII. Of the Eclipses of the Sun and Moon
XXIV. Of the new Planet, and other Discoveries

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371

391

AN EXPLANATION of the principal Terms made

use of in Astronomy

407

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