Karl Ludwig Drobisch
... that the German composer Karl Ludwig Drobisch and his brother calculated planetary movements?
... that the German composer <b id="mwAk0"><a href="./Karl_Ludwig_Drobisch" id="mwAk4" rel="mw:WikiLink" title="Karl Ludwig Drobisch">Karl Ludwig Drobisch</a></b> and <a href="./Moritz_Wilhelm_Drobisch" id="mwAk8" rel="mw:WikiLink" title="Moritz Wilhelm Drobisch">his brother</a> calculated planetary movements?