@misc{Chauvenet_William_A_1863,
 author={Chauvenet, William},
 address={Philadelphia},
 howpublished={online},
 year={1863},
 publisher={J. B. Lippincot and CO.},
 language={eng},
 type={text},
 title={A manual spherical and practical astronomy. Vol. II},
 keywords={practical astronomy, astronomical instruments, methods of observation},
}