Sun-spot drawings made at the Georgetown College Observatory in 1850, September 20 to November 6
By: by Father Benedict Sestini, S.J. 44 plates.
Contributors: Georgetown university, D.C. Observatory.
Published: 1898
Place of publication: Washington, D.C
Language: eng
Subjects: Sunspots.
Notes: At head of title: Georgetown College Observatory.
Preface signed: J.G. Hagen, S.J.
First pub. in U.S. Naval observatory. Astronomical observations, vol. III, 1853. Appendix A.