1910 Astronomy Textbook

Arthur Gron:

It found the book interesting because it’s reads like a popular introduction into astronomy but has some mathematics, to make the book feel more sub- stantive. Even out the outset of the book the author tries to quantify even the simplest things.
The number of stars visible to the unaided eye is very deceptive. To the superficial observer this number appears to run far into the thousands, but an actual count will show that a normal eye cannot see more than from 1,000 to 1,500 at any one time. And as we can see only one-half of the whole heavens at once, the total number of stars visible in both hemispheres will vary from 2,000 to 3,000, depending on the quality of the observer’s eye. (Page 3 and 4)
The book presents facts to make the reader feel more comfortable with as- tronomy.