Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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>A DISCOVRSE
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Preſented to the Moſt Serene DON COSIMO II.
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GREATDUKE of
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TUSC ANY:
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CONCERNING
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The Natation of BODIES Upon, or Submerſion
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In, the WATER.
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>Conſidering (Moſt Serene Prince) that the
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publiſhing this preſent Treatiſe, of ſo
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different an Argument from that which
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many expect, and which according to the
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intentions I propoſed in my ^{*} Aſtronomi
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call
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Adviſo,
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I ſhould before this time
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have put forth, might peradventure make
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ſome thinke, either that I had wholly
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relinquiſhed my farther imployment
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about the new Celeſtiall Obſervations,
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or that, at leaſt, I handled them very
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remiſſely; I have judged fit to render an account, aſwell of my
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deferring that, as of my writing, and publiſhing this treatiſe.</
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His Nuncio Sl
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derio.</
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>As to the firſt, the laſt diſcoveries of
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Saturn
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to be tricorporeall, and
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of the mutations of Figure in
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Venus,
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like to thoſe that are ſeen in the
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Moon, together with the Conſequents depending thereupon, have
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not ſo much occaſioned the demur, as the inveſtigation of the times
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of the Converſions of each of the Four Medicean Planets about
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piter,
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which I lighted upon in
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April
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the year paſt, 1611, at my being in
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Rome
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; where, in the end, I aſſertained my ſelfe, that the firſt and neereſt
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to
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Jupiter,
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moved about 8
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gr.
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& 29
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m.
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of its Sphere in an houre,
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ing its whole revolution in one naturall day, and 18 hours, and almoſt
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an halfe. </
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>The ſecond moves in its Orbe 14
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gr. </
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>13 min.
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or very neer,
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in an hour, and its compleat converſion is conſummate in 3 dayes, 13
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hours, and one third, or thereabouts. </
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>The third paſſeth in an hour,
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2
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gr. </
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<
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>6 min.
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little more or leſs of its Circle, and meaſures it all in 7
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dayes, 4 hours, or very neer. </
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<
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>The fourth, and more remote than the
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reſt, goes in one houre, o
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gr 54 min.
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and almoſt an halfe of its Sphere,
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and finiſheth it all in 16 dayes, and very neer 18 hours. </
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<
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>But
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cauſe the exceſſive velocity of their returns or reſtitutions, requires a
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moſt ſcrupulous preciſeneſſe to calculate their places, in times paſt </
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