1. Assuming that the Sun makes an angle of 1 ⁄2° in our sky and is at a distance of 1.496 10 11 m, what is the Sun’s diameter? Divide this value by 2 to find the Sun’s radius and explain why this...

1. Assuming that the Sun makes an angle of 1 ⁄2° in our sky and is at a distance of 1.496
10¹¹
m, what is the Sun’s diameter? Divide this value by 2 to find the Sun’s radius and explain why this result is slightly different from the value given in Appendix E-8 at the back of the book.

2. How long was the exposure for the photograph of circumpolar star trails in Figure 1-9?

 Figure 1-9