Astronomy with an Opera-glass is a useful handbook for those interested in stargazing without telescopes. The entrancing maps of the night sky will be useful for anyone with a curious mind. Excerpt: "It makes no difference at what time of the year such observations are begun, but for convenience, I will suppose that they are begun in the spring. We can then follow the revolution of the heavens through a year…"
Pubblicato da: DigiCat