Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 6/11, 1897

Table of handwritten notes

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            <s xml:id="echoid-s4321" xml:space="preserve">
              <pb o="136" file="340" n="340"/>
            wird. </s>
            <s xml:id="echoid-s4322" xml:space="preserve">— Der Schiffskapitän, der ſich ſolch ein Buch mit Vor-
              <lb/>
            ausberechnungen mit auf die Reiſe nimmt, findet in demſelben
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            genau Stunde, Minute und Sekunde angegeben, wann jedesmal
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            dergleichen am Himmel paſſiert, und zwar iſt die Zeit aufs
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            allergenaueſte nach dem Heimats-Ort berechnet.</s>
            <s xml:id="echoid-s4323" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4324" xml:space="preserve">Iſt nun die Heimats-Uhr des Schiffes abgelaufen oder
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            fürchtet der Seefahrer, daß ſie nicht genau richtig geht, ſo
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            braucht er nur ſein Fernrohr zur Hand zu nehmen und irgend
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            eine Finſternis auf dem Jupiter abzuwarten. </s>
            <s xml:id="echoid-s4325" xml:space="preserve">Sobald er dieſe
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            ſieht — und ſolche iſt immer ſehr leicht zu bemerken — ſchlägt
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            er ſein Buch nach und findet, wie ſpät es daheim in dieſem
              <lb/>
            Augenblick iſt, und ſomit iſt er imſtande, die ihm ſo notwendige
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            Heimats-Uhr in Ordnung zu bringen.</s>
            <s xml:id="echoid-s4326" xml:space="preserve"/>
          </p>
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            <s xml:id="echoid-s4327" xml:space="preserve">Zwar giebt es noch einige Himmelserſcheinungen, die dem
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            Schiffsführer aus gleicher Verlegenheit helfen können, keine
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            jedoch iſt ſo leicht und einfach und genau, wie die Beobachtung
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            der Verfinſterungen auf dem Planeten Jupiter, und es wird
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            jedermann nunmehr einſehen, daß die Verfinſterungen uns
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            wohl etwas angehen und deren Berechnungen für uns vom
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            größten praktiſchen Nutzen ſind.</s>
            <s xml:id="echoid-s4328" xml:space="preserve"/>
          </p>
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            <s xml:id="echoid-s4329" xml:space="preserve">Wer dieſe Zeilen beim Genuß ſeines Kaffees oder Thees
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            lieſt, ohne viel an den Nutzen der Schiffahrt zu denken, der
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            möge wohl überlegen, daß ſein Lieblingsgetränk wahrſcheinlich
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            noch einmal ſo teuer ſein würde, wenn nicht die Fahrten auf
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            dem Meere durch die Verfinſterungen auf dem Jupiter leicht
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            zu regeln wären, und er wird zugeben müſſen, daß uns die
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            Aſtronomie ſelbſt dann ſehr zu Nutzen kommt, wenn wir, im
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            Trocknen ſitzend, ihrer am allerwenigſten gedenken.</s>
            <s xml:id="echoid-s4330" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4331" xml:space="preserve">Was aber hat das alles mit der Geſchwindigkeit des
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            Lichtes zu thun?</s>
            <s xml:id="echoid-s4332" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4333" xml:space="preserve">Das wollen wir ſogleich ſehen.</s>
            <s xml:id="echoid-s4334" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s4335" xml:space="preserve">Die Verfinſterungen der Jupitermonde waren recht eigentlich
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            die Urſache, hinter den Gedanken zu kommen, daß das </s>
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