ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Elementa Eclipsium. Title page for Elementa Eclipsium, a Czech book on eclipses that was published in 1816. This book was written by Franz Ignaz Cassian Hallaschka (1780-1847) and contained the maps for predicted eclipses between 1816 and 1860. The geometric constructions used by Hallaschka anticipated the standard theory of eclipses developed later by Friedrich Wilhelm Bessel.
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