Harris, John · Montreal, Lovell Printing and Publishing Co. · leaf 182
ravitation is provisional on!y : it will be seen hereafterthat our theory supposes an expanding compound orbit, viz., that thecomet on leaving the one orbit and entering the other approaches nearerthan its average distance to the centre of gravitation, and then commencesand continues to recede… … 80LAB AND PLANETARY ORBIT. 15 trolled and regulated by two distinct centres of gravitat-ing inj3uence ; nor are we prevented from supposing thatthe orbit may be yet more complex, and that three oreven several systems may be traversed in a similar man-ner and in obedience, as already explained^ to…
Astronomy
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