@misc{Arago_Franz_Populäre_1856,
 author={Arago, Franz},
 address={Leipzig},
 howpublished={online},
 year={1856},
 publisher={Verlag von Otto Wigand},
 language={ger},
 type={text},
 title={Populäre Astronomie. Bd. 2},
 keywords={solar system, sun and comets},
}