The young gentleman's astronomy, chronology, and dialling ... / [Edward Wells].

  • Edward Wells
Date:
[1712]
Catalogue details

Licence: Public Domain Mark

Credit: The young gentleman's astronomy, chronology, and dialling ... / [Edward Wells]. Source: Wellcome Collection.

    87/388 page 59
    Thefe Shadows are of a (f) conical Figure, growing narrower and nar¬ rower, the further they go from the Earth and Moon, till at Length they end in a Point, and fo ceafe. Were thefe Shadows, either of a (]|) cylin¬ drical Figure, i. e. of an equal Thick- nefs all along 5 or of a (||) conical Figure, but inverted the other Way, /. e. did they grow thicker and thick¬ er, the further they are extended, then they would be extended in infi¬ nitum. But now ’tis certain, that the Shade of the Earth does not extend to the Orbit of the primary Planet Mars ; forafmuch as when the Earth is dire&ly between the Sun and Mars\ the latter is not eclipfed, as it muft neceffarily be, did the Shade of the Earth reach to the Orbit of x ■ ■ u Mars. It being thus demonftrable, that the Shadow of the Earth ends in a Point, before it comes to the Orbit of Mars $ hence it is alfo demonftrable, that the Sun is bigger than the Earth $ forafmuch as an opacous Body can’t The Sun how de~ monjlrated to be big¬ ger than the Earth, and the Earth than the ft) As in Fig. 15, (|| |1) This is evident from Fig* 11. and 12. caft
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