Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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        <div xml:id="echoid-div308" type="section" level="1" n="142">
          <p>
            <s xml:id="echoid-s6990" xml:space="preserve">
              <pb o="594" file="0330" n="347" rhead="CHRIST. HUGENII"/>
            quidem ex tranſitu ſideris alicujus, cujus tempus numeretur
              <lb/>
            vibrationibus perpendiculi, vel ope Horologii noſtri oſcil-
              <lb/>
            latorii nuper inventi, teleſcopio interim immoto manente.
              <lb/>
            </s>
            <s xml:id="echoid-s6991" xml:space="preserve">Scimus enim 4 ſcrupulis horariis unum cæli gradum & </s>
            <s xml:id="echoid-s6992" xml:space="preserve">exi-
              <lb/>
            guum quid amplius tranſire: </s>
            <s xml:id="echoid-s6993" xml:space="preserve">ideoque ſi verbi gratia numeren-
              <lb/>
            tur ſcrupula ſecunda 69 interea dum ſtella quædam fixa to-
              <lb/>
            tam teleſcopii capacitatem emetitur, argumento id erit 17{1/4}
              <lb/>
            ſcrupula prima, teleſcopii hujuſmodi apertura comprehendi,
              <lb/>
            ſicut noſtro evenit. </s>
            <s xml:id="echoid-s6994" xml:space="preserve">Quo invento virgulam unam atque al-
              <lb/>
            teram ex ære aliave materia parare oportet, decreſcente pau-
              <lb/>
            latim latitudine, tubumque perforare utrinque circa locum
              <lb/>
            illum paulo ante memoratum, quo poſſint in ipſo ejus pun-
              <lb/>
            cto virgulæ tranſverſæ ante oculum obtendi. </s>
            <s xml:id="echoid-s6995" xml:space="preserve">Cum igitur
              <lb/>
            Planetæ alicujus diametrum metiri cupimus, adhibitâ eo quo
              <lb/>
            diximus loco virgulâ, notandum eſt quænam hujus latitudo
              <lb/>
            totum Planetam contegere poſſit. </s>
            <s xml:id="echoid-s6996" xml:space="preserve">Eâ enim latitudine acuto
              <lb/>
            deinde circino acceptâ, atque ad totius foraminis amplitudi-
              <lb/>
            nem collatâ, Planetæ diameter apparens facili ratiocinio in-
              <lb/>
              <note position="left" xlink:label="note-0330-01" xlink:href="note-0330-01a" xml:space="preserve">Diameter
                <lb/>
              Veneris ob-
                <lb/>
              ſervata.</note>
            noteſcet. </s>
            <s xml:id="echoid-s6997" xml:space="preserve">Sic die 29 Dec. </s>
            <s xml:id="echoid-s6998" xml:space="preserve">1658 diametro Veneris inveni-
              <lb/>
            mus convenire virgulam cujus latitudo æquabat {1/20} totius fo-
              <lb/>
            raminis: </s>
            <s xml:id="echoid-s6999" xml:space="preserve">eſt autem hoc, uti diximus, 17′, 15″. </s>
            <s xml:id="echoid-s7000" xml:space="preserve">Ergo Vene-
              <lb/>
            ris diameter erat 51″, 45″′. </s>
            <s xml:id="echoid-s7001" xml:space="preserve">Diſtantia autem Planetæ ad mini-
              <lb/>
            mam ſuam à Terris diſtantiam ſe habebat circiter ut 27 ad 16,
              <lb/>
            ergo diameter ejus terris proximæ efficitur 87′, 20″′. </s>
            <s xml:id="echoid-s7002" xml:space="preserve">Rurſus
              <lb/>
            anno 1659, 8 Mart. </s>
            <s xml:id="echoid-s7003" xml:space="preserve">hora 6 mat. </s>
            <s xml:id="echoid-s7004" xml:space="preserve">Veneris diametrum obſer-
              <lb/>
            vavimus quæ æquabat {4/67} aperturæ teleſcopii. </s>
            <s xml:id="echoid-s7005" xml:space="preserve">Ideoque erat
              <lb/>
            61″, 30″′. </s>
            <s xml:id="echoid-s7006" xml:space="preserve">Diſtantia autem eo tempore ad minimam Veneris
              <lb/>
            à terris diſtantiam ſe habebat ut 430 ad 316, ergo diameter
              <lb/>
            ejus maxima fit 83″, 40″′. </s>
            <s xml:id="echoid-s7007" xml:space="preserve">Sed & </s>
            <s xml:id="echoid-s7008" xml:space="preserve">alias eadem methodo ſem-
              <lb/>
            per tantum paulo majorem minoremve invenimus, nam ſæ-
              <lb/>
            pius examen hoc repetivimus, atque ex omnibus medium
              <lb/>
            quid ſumentes, 85″ pro maxima Veneris diametro ſupra ſta-
              <lb/>
            tuimus. </s>
            <s xml:id="echoid-s7009" xml:space="preserve">Hanc autem Ricciolus 4″, 8″, taxavit, atque adeo
              <lb/>
            triplo quam nos majorem exiſtimat, ſed procul dubio nuda
              <lb/>
            illa oculi æſtimatione, qua hîc uſus eſt, in tantum deceptus
              <lb/>
            fuit. </s>
            <s xml:id="echoid-s7010" xml:space="preserve">Nam Saturni Joviſque diametros, quas methodo </s>
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