Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſented by figures anſwerable to thoſe which we ſee in the Moon:
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I comprehend alſo, how the period of its illumination and
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tion of figure, would be monthly, albeit the Sun revolves round
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about it in twenty four hours: and laſtly, I do not ſcruple to
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admit, that the half onely of the Moon ſeeth all the Earth, and
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that all the Earth ſeeth but onely half of the Moon. </
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<
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>For what
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remains, I repute it moſt falſe, that the Moon can receive light
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from the Earth, which is moſt obſcure, opacous, and utterly
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apt to reflect the Suns light, as the Moon doth reflect it to us: and
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as I have ſaid, I hold that that light which we ſee in the
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der of the Moons face (the ſplendid creſcents ſubducted) by the
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illumination, is the proper and natural light of the Moon, and no
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eaſie matter would induce me to believe otherwiſe. </
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<
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>The ſeventh,
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touching the mutual Eclipſes, may be alſo admitted; howbeit
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that is wont to be called the eclipſe of the Sun, which you are
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pleaſed to phraſe the eclipſe of the Earth. </
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<
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>And this is what
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I
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have at this time to ſay in oppoſition to your ſeven congruities
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or reſemblances, to which objections, if you are minded to make
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any reply,
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I
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ſhall willingly hear you.</
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The ſuperficies of
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the Moon more
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ſleek than any
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Looking-glaß.
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The eminencies
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and cavities in the
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Moon are illuſions
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of its opacous and
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perspicuous parts.
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<
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>SALV. </
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>If I have well apprehended what you have anſwered, it
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ſeems to me, that there ſtill remains in controverſie between us,
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tain conditions, which I made common betwixt the Moon & Earth,
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and they are theſe; You eſteem the Moon to be ſmooth and poliſht,
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as a Looking-glaſs, and as ſuch, able to reflect the Suns light; and
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contrarily, the Earth, by reaſon of its montuoſity, unable to make
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ſuch reflection: You yield the Moon to be ſolid and hard, and that
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you argue from its being ſmooth and polite, and not from its being
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montuous; and for its appearing montuous, you aſſign as the
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cauſe, that it conſiſts of parts more and leſs opacous and
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cuous. </
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<
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>And laſtly, you eſteem that ſecondary light, to be proper
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to the
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M
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oon, and not reflected from the Earth; howbeit you
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ſeem not to deny the ſea, as being of a ſmooth ſurface, ſome
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kind of reflection. </
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<
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>As to the convincing you of that error, that
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the reflection of the
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M
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oon is made, as it were, like that of a
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Looking-glaſs,
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I
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have ſmall hope, whilſt
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I
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ſee, that what hath
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been read in the ^{*}
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Saggiator
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and in the
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Solar Letters
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of our
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mon Friend,
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hath profited nothing in your judgment, if haply
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you have attentively read what he hath there written on this
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ject.</
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*
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Il Saggiatore, &
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Lettere Solari,
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two Treatiſes of
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Galilæus.
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<
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>SIMPL.
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I
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have peruſed the ſame ſo ſuperficially, according to
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the ſmall time of leaſure allowed me from more ſolid ſtudies;
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therefore, if you think you can, either by repeating ſome of thoſe
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reaſons, or by alledging others, reſolve me theſe doubts,
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I
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will
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hearken to them attentively.</
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<
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I
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will tell you what comes into my mind upon the </
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