The celestial sphere and the ecliptic
Answers are for parents and teachers.
1
If a body’s altitude is 18°, what is its zenith distance in degrees?
72
2
If the Sun shifts ≈ 1° a day for 45 days, about how many degrees does it cover?
45
3
The ecliptic is divided into 12 equal arcs. How many degrees is one arc?
30
4
Why do the ecliptic and the celestial equator cross at two points? Explain briefly.
Two great circles (traces of two planes on the sphere) always cross at two diametrically opposite points.
5
Why is astrology not a science? Give one reason.
Its predictions have not been confirmed in controlled tests and it has no physical mechanism.