The Apparent Path of Halley's Comet in the Sky
Rigge, William F., S.J.
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First Paragraph: Halley’s comet, as we know, moves in a very elongated ellipse. While its farthest excursions carry it beyond the outermost planet of our system, its nearest approach to the Sun is almost half of our distance from that luminary. As the comet is visible to us only when in this latter part of its orbit, this is drawn somewhat in detail in Figure 1.