Vitruvius Pollio, I dieci libri dell?architettura, 1567

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                  <s id="s.007138">
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                  Del corſo del Sole per li dodici ſegni. </s>
                  <s id="s.007139">Cap. V.
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                  <s id="s.007140">IL Sole adunque quando entra nel ſegno del Montone, & traſcorre la ottaua
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                  parte di quello, fa lo equinottio di primauera. </s>
                  <s id="s.007141">ma andando piu oltra alla co
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                  da del Toro, & alle Stelle Vergilie, dalle quali auanza la prima metà del To
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                  ro, corre in maggiore, & piu ampio ſpatio del Cielo, della metà uerſo la par
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                  te Settentrionale. </s>
                  <s id="s.007142">Partendoſi poi dal Toro quando entra ne i Gemelli, naſcendo le Ver­
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                  gilie, creſce anchora piu ſopra la terra, & fa maggiori gli ſpatij de i giorni. </s>
                  <s id="s.007143">indi da i Gemel
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                  li, quando entra nel Cancro, il quale occupa lunghiſsimo ſpatio del Cielo, giunto all'ot­
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                  taua parte fa il tempo del Solſtitio, & caminando peruiene al capo, & al petto del Leo­
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                  ne. </s>
                  <s id="s.007144">Perche quelle partiſono attribuite al Cancro. </s>
                  <s id="s.007145">Ma dal petto del Leone, & da i termi
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                  ni del Cancro l'uſcita del Sole correndo alle altre parti del Leone, ſcema la grandezza de i
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                  giorni, & de i giri, & ritorna in corſo eguale a quello, che egli faceua, quando cra ne i
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                  Gemelli. </s>
                  <s id="s.007146">indi poi paſſando dal Leone alla Vergine, & andando piu oltre al ſeno della ue­
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                  ſte di quella in quello reſtrigne i giri ſuoi, & gli pareggia con quelli, che egli faceua eſ­
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                  ſendo nel Toro. </s>
                  <s id="s.007147">Vſcito di Vergine per lo ſeno della ueſte di quella che occupa le prime
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                  parti della Bilancia, nella ottaua parte della Bilancia fa lo equinottio dello Autunno. </s>
                  <s id="s.007148">
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                  Et quel corſo è pari al corſo gia fatto nel Montone. </s>
                  <s id="s.007149">Ma entrando poi il Sole nello Scor­
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                  pione cadendo le Vergilie, andando piu inanzi uerſo le parti meridiane ſcema la lunghez­
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                  za de i giorni. </s>
                  <s id="s.007150">Venendo poſcia dallo Scorpione al Sagittario, quando egli entra nelle par
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                  ti anteriori di quello paſſa piu ſtretto corſo del giorno. </s>
                  <s id="s.007151">Ma cominciando dalle coſcie di
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                  dentro del Sagittario, le quali parti ſono attribuite al Capricorno, giunto alla ottaua par
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                  te fa un breuiſsimo ſpatio del Cielo, & d'indi dalla breuità de i giorni quel tempo è detto
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                  Bruma, & i giorni brumali. </s>
                  <s id="s.007152">Ma paſſando dal Capricorno all'Acquario creſce, & aggua
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                  glia con la lunghezza del dì lo ſpatio del Sagittario. </s>
                  <s id="s.007153">Dallo Acquario, quando è entrato
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                  ne Peſci ſpirando il uento Fauonio acquiſta corſo eguale allo Scorpione. </s>
                  <s id="s.007154">& coſi il Sole an
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                  dando per que ſegni a certi, & determinati tempi fa creſcere, & ſcemate gli ſpatij de i gior
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                  ni, & delle hore. </s>
                  <s id="s.007155">Ma io dirò delle altre conſtellationi, che ſono ornate di ſtelle dalla ſini
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                  ſtra, & dalla deſtra della zona de i ſegni, della parte meridiana, & ſettentrionale del
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                  Mondo. </s>
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                <p type="main">
                  <s id="s.007156">
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                  Quiui ci rende Vitr. la ragione del creſcere, & del calare de i giorni, ma breuemente, &
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                  piu presto ci eſpone lo effetto, che fa il Sole nel Mondo entrando di ſegno in ſegno cercando la quan
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                  tità de i giorni: benche la ragione ſia queſta, che il Sole ſopra terra di ſegno in ſegno faccia mag­
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                  giori, & minori archi del Cielo. </s>
                  <s id="s.007157">Però noi ſaldaremo anche queſta partita, dicendone la cagio­
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                  ne intieramente. </s>
                  <s id="s.007158">percioche quando a noi creſceno i giorni, ad altri uanno ſcemando, però doue­
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                  mo abbraciare tutta la cauſa di tale effetto, & non quella, che a noi habitanti di qua dallo equi
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                  nottiale ſerue ſolamente. </s>
                  <s id="s.007159">In due modi adunque s'intende giorno. </s>
                  <s id="s.007160">prima lo ſpatio, che fa il Sole
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                  col Mondo girando una fiata nel termine di hore uentiquattro; & queſta è l'ordinaria ſignificatio
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                  ne di queſto nome preſo uulgarmente. </s>
                  <s id="s.007161">Imperoche gli eſperti Aſtronomi, al giro di hore uenti­
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                  quattro, danno quello di piu, che il Sole ha fatto in quel tempo col ſuo mouimento contrario a
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                  quello del Mondo. </s>
                  <s id="s.007162">nè è merauiglia ſe in questo ſpatio è compreſa anche la notte; perche riſpetto
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                  a tutto il Mondo ſempre luce il Sole, & fa giorno in qualche luogo. </s>
                  <s id="s.007163">L'altra ſignificatione è,
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                  che per giorno s'intende quello ſpatio, che in alcun luogo il Sole ſta ſopra l'orizonte. </s>
                  <s id="s.007164">nel primo mo
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                  do comincia il giorno al mezo dì, & termina al mezo dì ſeguente. </s>
                  <s id="s.007165">Percioche a qualunque habi
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                  tanti della terra stando fermo, doue egli ſi troua ogni giorno dell'anno il Sole peruiene al mezo
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                  dì ſopra uno isteſſo circolo, che paſſa da un polo all'altro, per lo punto, che gli sta ſopra il capo,
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