CONTENTS.

XIV. Of the Reformation of the Calendar. 222

XV. Of the Mensuration of the Earth. 244

XVI. The same subject continued. 260

XVII. Of the Distances and Magnitudes of

the Sun, Moon, and Planets. 274

XVIII. The same subject continued. 289

XIX. Of the Motion, Refraction, and Ab-erration of Light. j ro

XX. Of the Constellations, and the Phæ-

nomena of the fixed Stars. 335

XXI. Of the Phænomena and Affections

of the Sun, Moon, and Planets. 353-

XXII. Of the Eclipses of the Sun and

Moon. 3-6

XXIII. Of the new Planet, and other Dis-coveries. 3H7

An Explanation of the principal Termsmade Use of in Astronomy. 413

LET,