Dieses Buch enth lt zwei wichtige Abhandlungen ber sph rische Trigonometrie von Leonhard Euler. Die erste Abhandlung von 1753 besch ftigt sich mit den Grundlagen der sph rischen Trigonometrie und bietet eine Einf hrung in die wichtigsten Konzepte. Die zweite Abhandlung von 1779 ist eine allgemeinere Darstellung der sph rischen Trigonometrie und enth lt viele praktische Anwendungen.
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