Chapter Questions
If the shape of the Earth's orbit were unaltered but its rotation axis were shifted so that it had no tilt with respect to the orbit, how would seasons be affected?
Suppose the Earth's axis were tilted by $10^{\circ}$ instead of $23.5^{\circ}$ Where would the tropics and arctic regions be? How would seasons be different?
Suppose the Earth's axis were tilted by $50^{\circ}$ instead of $23.5^{\circ}$ Where would the tropics and arctic regions be? How would seasons be different?
Suppose the Earth's axis were tilted by $90^{\circ}$ instead of $23.5^{\circ}$ Where would the tropics and arctic regions be? How would the seasons be different?
Describe the motion you would see on the solstices and the equinoxes if you were observing the Sun from the Arctic Circle, at a latitude of $66.5^{\circ} \mathrm{N}$
If you wished to observe a star with a right ascension of $12^{\mathrm{h}}$ what would be the best time of year to observe it? What would be the best time to observe a star with a right ascension of $6^{\mathrm{h}}$ ? (Also see Unit $5.5 .)$