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ern observations made with instruments of
the highest precision.
So again, Mr. Hind [3] was enabled to
trace back the period during which Halley’s
comet has been a member of the solar sys-
tem, and to identify it in the Chinese ob-
servations of comets as far back as 12 B.C.
Cowell and Cromellin extended the date to
240 B.C. In the same way the comet 1861.i.
33
