The elements of astronomy; a textbook . 9 Magnitudes 0 1 2 S 4 5 Nebula ClusterSymbols #*** + • O 9 MAPT.

---

Size: 1118px × 2234px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1910, booksubjec, booksubjectastronomy