Annals of medical history . ain. For with us [in Italy] a star is nearthe horizon when it turns southward andit passes eastward near the zenith. Let abcd be the earth and fa ourhorizon, efgh the sphere of vapors,kl the equator k and e a northernand f a southernstar. But thesouthern star isnear our horizonand is seen alongthe line fa, thenorthern star is,however, nearerthe zenith and seen along the line ea,which is less than fa. For a similar reason some of theplanets seem larger when they are inquadrature to the sun, so that his speciesis refracted through a greater part oftheir sphere, a matt
Annals of medical history . ain. For with us [in Italy] a star is nearthe horizon when it turns southward andit passes eastward near the zenith. Let abcd be the earth and fa ourhorizon, efgh the sphere of vapors,kl the equator k and e a northernand f a southernstar. But thesouthern star isnear our horizonand is seen alongthe line fa, thenorthern star is,however, nearerthe zenith and seen along the line ea,which is less than fa. For a similar reason some of theplanets seem larger when they are inquadrature to the sun, so that his speciesis refracted through a greater part oftheir sphere, a matter of which we shalltreat presently. But (not only the character but) alsothe position of the medium affects theappearance of the object seen, as may beobserved with lenses (in specillis ocular-ibus). For if a lens be placed midwaybetween eye and object, it appears muchlarger than if the lens is made to approachthe object or the others in the Problemata of Aristotle and by Archi-medes, Seneca and Heron of 10 Annals of Medical History Now concerning the differing appear-ance of the moon, according as it is inquadrature or rapid motion [ perigee].In both, it appears larger and nearer andits appearance varies greatly. . Themoon appears larger and nearer when inquadrature because the species of the sunfalling upon the moon is refracted througha greater part of the sphere than whenthe moon is in any position other thanquadrature. Let gfdh be the moons sphere andlet kh represent its depth, the sun beingat a, abovethe moon inquadrature atc or e. Speciesor rays fromthe sun cometo the moonalong the linesbc or thosewhich are re-fracted at lH through inthe otherquad raturethey comethrough de or le, nor can therebe any longer lines than these [ re-fracted through a greater depth of medi-um] when the moon is in other the species of the sun is morerefracted in quadrature than in any otherposition; wherefore the moon appearslarger
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Keywords: ., bookauthorp, bookcentury1900, bookdecade1910, booksubjectmedicine
