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the system of the world.
563
TABLE I.
| The distance of a comet's perihelion from the Suns's centre. |
The time of a comet's passage from its perihelion to a distance from the sun equal to | |||
| The radii of the orbis magnus. |
To its double. | To its triple. | To its Quadruple. | |
0 5 10 20 40 80 160 320 640 1280 2560 |
d. h. ′ 27 11 12 27 16 07 27 21 00 28 06 40 29 01 32 30 13 25 33 05 29 37 13 46 37 09 49 |
d. h. ′ 77 16 28 77 23 14 78 06 24 78 20 13 79 23 34 82 04 56 86 10 26 93 23 38 105 01 28 106 06 35 |
d. h. ′ 142 17 14 144 03 19 153 16 08 200 06 43 147 22 31 |
d. h. ′ 219 17 30 221 08 54 232 12 20 297 03 46 300 06 03 |
- [This table, here corrected, is made on the supposition that the earth's diurnal motion is just 59′, and the measure of one minute loosely 0,2909, in respect of the radius 1000. If those measures are taken true, the true numbers of the table will all come out less. But the difference, even when greatest, and to the quadruple of the earth's distance from the sun, amounts only to 16h.55′.]
The time of a comet's ingress into the sphere of the orbis magnus, or of its egress from the same, may be inferred nearly from its parallax, but with more expedition by the following
TABLE II.
| The apparent elongation of a comet from the sun. |
Its apparent diurnal motion in its own orbit. |
Its distance from the earth in parts whereof the radius of the orbis magnus contains 1000. | |
60° 65 70 72 74 76 78 80 82 84 86 88 90 |
Direct. 2° 18′ 2 33 2 55 3 07 3 23 3 43 4 10 4 57 5 45 7 18 10 27 18 37 Infinite |
Retrog. 00° 20′ 00 35 00 57 01 09 01 25 01 45 02 12 02 49 03 47 05 20 08 19 16 39 Infinite |
1000 845 684 618 651 484 416 347 278 209 140 70 00 |
