Book, Paragraph

 1   I,  6 |   tail at all. But when it is visible in the north it assumes
 2   I,  6 |  planet ought sometimes to be visible without a tail since, as
 3   I,  6 |     And all of them are often visible above the horizon together
 4   I,  6 |      when all the planets are visible as when some are not, but
 5   I,  8 |      circle (half of it being visible at any time of the night),
 6   I,  13|    that all these regions are visible up to the last peak. From
 7   I,  13|    fall into it and it has no visible outlet but issues below
 8  II,  3 |   time she made the mountains visible; the second time the islands;
 9  II,  5 | tropic, of the other the ever visible circle, their vertex is
10  II,  6 |       coincides with the ever visible circle, but not quite.)
11 III,  3 |       them is too small to be visible, but their contiguity makes
12 III,  4 |  violet. No further change is visible, but three completes the
13 III,  5 |      horizon, and the segment visible will be smallest when the
14 III,  5 |      north of the equator the visible arcs of its course are all
15 III,  5 |      south of the equator the visible arc is small and the invisible
16 III,  5 |     solstice, the size of the visible arc is such that before
17 III,  5 |   being the great size of the visible arc, and the consequent
18 III,  5 |       the winter solstice the visible arcs are small, and the