Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 308
COMETS AND METEORS 267 and 1682, he concluded that the three comets were identical—the famous comet bearing his name : the records of thiscomet go back without a break to the year 989 and with afew gaps back to the second century B.C. Halley thereforeconcluded that the orbit, though very nearly…
Astronomy
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