Note 97 — PART III. INFLUENCE OF COMETS AND PLANETS UPON ONE ANOTHER.

Pingré calculates, that, after the lapse of one hour, the Comet, in a certain case, would be vertical to a part of the Earth, distant 23° from the former; and by that time have also removed itself nearly 1.3 farther from the earth. In another supposition, he finds, that, after the lapse of the first half hour, the change in its vertical position would amount to no less than 81°; and in its distance from the earth, nearly three times the original distance of 13000 leagues.