The Sun Relative to the Observer No two observers ever see the Sun behave exactly alike. This difference means that we need No two observers ever see the Sun behave exactly alike. This difference means that we need time zones. It also leads to extremely long summer days near the Earth's poles. In fact, it's even time zones. It also leads to extremely long summer days near the Eanth's poles, In fact, it's even possible to lie second time! In this section, you'll explore how the Sun looks different for observers at different latitudes. To do this, you'll turn the celestial sphere so different latitudes point up. This means that zenith for an observer standing on the Earth at the specified latitude will be found at the top of the sphere, and the horizon of that observer will coincide with the horizontal ring. The work you'll do in this section will tell you the position of the Sun at noon on the date specified. It's also possible to use the sphere to measure the position of the Sun at other times of day, but that gets a lot more complicated. To start, use the control knob to move the Sun to June 21. 8. Start with the north pole (latitude =90 ∘
N ) pointed up. Turn the sphere so the Sun aligns with the vertical ring. Use the degree makers on the vertical ring to measure the distance (in degrees) from the horizon (horizontal ring) to the Sun. How many degrees above the horizon is the Sun at noon on June 21 sll ? 23 ∘
9. Now tilt the sphere sideways so that Denver (lat=40 ∘
N) is on top. Make sure that the Sun still lines up with the vertical ring. How high (in degrees) does the Sun get on June 21 sl? 270 10. Use the control knob to move the Sun along its complete path. Make sure to keep the Sun aligned with the vertical ring as you move it. On what date is the Sun lowest in the sky at noon? Dec 21 st 11. Is there ever a day that the Sun does not rise in Denver? (That is, are there any days when the Sun's position at noon is below the horizon?) No 12. Return the Sun to June 21 st and tilt the sphere sideways so that Quito, Ecuador ( lat =0 ∘
) is on top. Make sure that the Sun lines up with the vertical ring. How high does the Sun get in Quito on June 21 31
? 20 ∘
13. Finally, tilt the sphere so that Cape Horn (southern tip of South America; lat =55 ∘
S ) is on top. How high does the Sun get at Cape Horn on June 21 st? ? 20 ∘
14. Consider your answers in #9 \& #13 and what we learned about the Sun and seasons in class. Based on these factors, what season do you think it is in Denver on June 21 st? ? What about at Cape Horn? Explain your reasoning.