Vitruvius, De architectura libri decem, 1567

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                <pb o="314" file="514.01.346" n="346" rhead="LIBER"/>
              ticalis plani officium eſſe meridianas partes a ſeptentrionalibus ſeparare, ideo horologia in eo plano deſeri-
                <lb/>
              pta ad meridiem, aut ad ſeptentrioncm uergent. </s>
              <s xml:id="echoid-s23842" xml:space="preserve">quemadmodum igitur in deſcribendis horologijs in plano fi-
                <lb/>
              nitoris, duas portiones ſeu arcus circulorum quæſiuimus, ut longitudinem, & </s>
              <s xml:id="echoid-s23843" xml:space="preserve">latitudinem umbræ uenare-
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              mur, ita hoc quoque loco in horologijs in plano uerticalis deſcribendis duis circumferentias, & </s>
              <s xml:id="echoid-s23844" xml:space="preserve">arcus aſſu-
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              memus, e quibus una Solis altitudinem ſuper id planum ſingulis horis oſtendet, unde umbræ longitudo elicie-
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              tur, & </s>
              <s xml:id="echoid-s23845" xml:space="preserve">ideo circumferentia horaria uocabitur: </s>
              <s xml:id="echoid-s23846" xml:space="preserve">altera umbræ latitudinem circa idem planum indicabit: </s>
              <s xml:id="echoid-s23847" xml:space="preserve">ho-
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              rariæ igitur circumferentiæ hoc modo a mobili meridiano trahuntur. </s>
              <s xml:id="echoid-s23848" xml:space="preserve">& </s>
              <s xml:id="echoid-s23849" xml:space="preserve">primum in æquinoctiali. </s>
              <s xml:id="echoid-s23850" xml:space="preserve">Esto a b
                <lb/>
              g d. </s>
              <s xml:id="echoid-s23851" xml:space="preserve">circulus ex centro e. </s>
              <s xml:id="echoid-s23852" xml:space="preserve">ductus. </s>
              <s xml:id="echoid-s23853" xml:space="preserve">a b, ſit ſectio communis meridiani, & </s>
              <s xml:id="echoid-s23854" xml:space="preserve">finitoris, g d. </s>
              <s xml:id="echoid-s23855" xml:space="preserve">diameter uer-
                <lb/>
              ticalis & </s>
              <s xml:id="echoid-s23856" xml:space="preserve">z e h. </s>
              <s xml:id="echoid-s23857" xml:space="preserve">diameter æquinoctialis. </s>
              <s xml:id="echoid-s23858" xml:space="preserve">eſto t z. </s>
              <s xml:id="echoid-s23859" xml:space="preserve">quarta æquinoctialis ſupra finitorem, hæc in ſex æquas
                <lb/>
                <note position="left" xlink:label="note-514.01.346-01" xlink:href="note-514.01.346-01a" xml:space="preserve">10</note>
                <figure xlink:label="fig-514.01.346-01" xlink:href="fig-514.01.346-01a" number="148">
                  <variables xml:id="echoid-variables104" xml:space="preserve">16 15 17 14 14 18 19 19 13 13 20 20 12 12 21 21 11 11 H 22 22 10 10 23 23 9 9 24 16 16 23 23 17 17 22 22 18 18 21 21 29 20</variables>
                </figure>
                <figure xlink:label="fig-514.01.346-02" xlink:href="fig-514.01.346-02a" number="149">
                  <variables xml:id="echoid-variables105" xml:space="preserve">19 20 21 18 17 22 23 17 16 18 17 9 15 14 13 11 13 20 16 12 21 17 20 22 21 11 22 10 23 9 18 L 17 18 19</variables>
                </figure>
                <figure xlink:label="fig-514.01.346-03" xlink:href="fig-514.01.346-03a" number="150">
                  <variables xml:id="echoid-variables106" xml:space="preserve">23 17 22 16 18 9 21 23 19 10 19 20 22 11 21 20 13 19 14 18 15 17 16 K</variables>
                </figure>
                <figure xlink:label="fig-514.01.346-04" xlink:href="fig-514.01.346-04a" number="151">
                  <variables xml:id="echoid-variables107" xml:space="preserve">17 18 19 20 21 22 16 23 15 14 13 12 11 10 11 12 21 22 10 9 23 M</variables>
                </figure>
                <note position="left" xlink:label="note-514.01.346-02" xlink:href="note-514.01.346-02a" xml:space="preserve">20</note>
                <note position="left" xlink:label="note-514.01.346-03" xlink:href="note-514.01.346-03a" xml:space="preserve">30</note>
                <note position="left" xlink:label="note-514.01.346-04" xlink:href="note-514.01.346-04a" xml:space="preserve">40</note>
              horarias portiones ſecetur, ſatis enim est quarta una, ad id quod uolumus oſtendendum, a ſingulis autem di-
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              uiſionibus ad diametrum æquinoctialis ducantur lineæ, quæ ſemidiametrum z e. </s>
              <s xml:id="echoid-s23860" xml:space="preserve">ſecent, quæ omnes lineæ
                <lb/>
              k l. </s>
              <s xml:id="echoid-s23861" xml:space="preserve">notentur. </s>
              <s xml:id="echoid-s23862" xml:space="preserve">Iam uero ut ſciamus arcus horarios ad Solis altitudinem excipiendam ſuper planum uer-
                <lb/>
                <note position="left" xlink:label="note-514.01.346-05" xlink:href="note-514.01.346-05a" xml:space="preserve">50</note>
              ticalis, a notis L. </s>
              <s xml:id="echoid-s23863" xml:space="preserve">ducendæ ſunt lineæ æquidiſtantes diametro uerticalis. </s>
              <s xml:id="echoid-s23864" xml:space="preserve">g c d. </s>
              <s xml:id="echoid-s23865" xml:space="preserve">uſque ad circumferentiam
                <lb/>
              meridiani, quæ g z. </s>
              <s xml:id="echoid-s23866" xml:space="preserve">literis continetur. </s>
              <s xml:id="echoid-s23867" xml:space="preserve">atque extremis earum linearum numeri horarum apponendi ſunt,
                <lb/>
              qui hic exempli gratia notati ſunt iuxta horas antiquas 11. </s>
              <s xml:id="echoid-s23868" xml:space="preserve">10. </s>
              <s xml:id="echoid-s23869" xml:space="preserve">9. </s>
              <s xml:id="echoid-s23870" xml:space="preserve">8. </s>
              <s xml:id="echoid-s23871" xml:space="preserve">7. </s>
              <s xml:id="echoid-s23872" xml:space="preserve">6. </s>
              <s xml:id="echoid-s23873" xml:space="preserve">quibus reſpondent 1. </s>
              <s xml:id="echoid-s23874" xml:space="preserve">2.
                <lb/>
              </s>
              <s xml:id="echoid-s23875" xml:space="preserve">3. </s>
              <s xml:id="echoid-s23876" xml:space="preserve">4. </s>
              <s xml:id="echoid-s23877" xml:space="preserve">5. </s>
              <s xml:id="echoid-s23878" xml:space="preserve">ſed 1 2. </s>
              <s xml:id="echoid-s23879" xml:space="preserve">ad g. </s>
              <s xml:id="echoid-s23880" xml:space="preserve">punctum uerticalis adſcribuntur. </s>
              <s xml:id="echoid-s23881" xml:space="preserve">Arcus igitur a puncto g. </s>
              <s xml:id="echoid-s23882" xml:space="preserve">ad undecimam,
                <lb/>
              uel primam horam pertingens, Solis altitudinem ſupra uerticalis planum g c d. </s>
              <s xml:id="echoid-s23883" xml:space="preserve">oſtendit primæ, uel undeci-
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              mæ horæ. </s>
              <s xml:id="echoid-s23884" xml:space="preserve">ſimilis ratio eſt de arcu ab g. </s>
              <s xml:id="echoid-s23885" xml:space="preserve">ad decimam, uel ſecundam horam, & </s>
              <s xml:id="echoid-s23886" xml:space="preserve">de reliquis arcubus reliquarũ
                <lb/>
              borarum, ex quibus Solis altitudo ſupra uerticalis planum habetur, cum Sol æquinoctialem circulum ambit. </s>
              <s xml:id="echoid-s23887" xml:space="preserve">
                <lb/>
              quod ſi libeat præter antiquas alias quoque ſpecies horarum deſcribcre, eadem diuiſione uti poteris, quoniam
                <lb/>
              omnia horarum genera in æquinoctialem pariter currunt. </s>
              <s xml:id="echoid-s23888" xml:space="preserve">Vnde ſi a meridie horas uelis, ubi eſt g. </s>
              <s xml:id="echoid-s23889" xml:space="preserve">notabis
                <lb/>
              6. </s>
              <s xml:id="echoid-s23890" xml:space="preserve">ubi eſt 11. </s>
              <s xml:id="echoid-s23891" xml:space="preserve">& </s>
              <s xml:id="echoid-s23892" xml:space="preserve">1. </s>
              <s xml:id="echoid-s23893" xml:space="preserve">facies 5. </s>
              <s xml:id="echoid-s23894" xml:space="preserve">& </s>
              <s xml:id="echoid-s23895" xml:space="preserve">7. </s>
              <s xml:id="echoid-s23896" xml:space="preserve">ubi 10. </s>
              <s xml:id="echoid-s23897" xml:space="preserve">& </s>
              <s xml:id="echoid-s23898" xml:space="preserve">2. </s>
              <s xml:id="echoid-s23899" xml:space="preserve">facies 4. </s>
              <s xml:id="echoid-s23900" xml:space="preserve">& </s>
              <s xml:id="echoid-s23901" xml:space="preserve">8. </s>
              <s xml:id="echoid-s23902" xml:space="preserve">ubi 9 & </s>
              <s xml:id="echoid-s23903" xml:space="preserve">3. </s>
              <s xml:id="echoid-s23904" xml:space="preserve">facies 3
                <lb/>
                <note position="left" xlink:label="note-514.01.346-06" xlink:href="note-514.01.346-06a" xml:space="preserve">60</note>
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