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Confiderations on the present State of Astronomy-By M. de Lalande.

. [From Memoires de L'Academie de Dijon.) HE great epochas of Astronomy Sun and of the Planets; of Refraction ; have been those of Hipparchus, and, in fine, of the discovery of Univer. 160 years before Christ; of Co: fal Attraction, published by Newton in

pernicus, in the year 1945; and 1687, which gave to Astronomy a new the observations made by Tycho-Braché face, and hath carried it to a degree of at the end of the same century, which perfection which it was before thought led Kepler to his discoveries ; at the incapable of. Same time that the invention of telescopes But this present century has not been opened to Galileo a new field for ob- deficient in aftronomical improvement. fervation. To the establishment of the In the year 1705 Mr Halley first predicFrench Academy of Sciences in 1666 we ted the return of a comet, which appearare indebted for the knowledge of the ed in 1759 ; in 1728 Mr Bradley made magnitude of our Globe; of the varia. the discovery of the aberration of the tion of the Pendulum; of the Micro- ftars; in 1736 the voyages were under. meter ; of the application of glasses to taken for measuring a degree of the methe Quadrant ; of the distances of the ridian which confirmed the idea of the VOL. XLIX

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