• You may study with your friends but the work you hand in should be your own. The main purpose of the homework is for you to learn the material - on which you will be tested later.
• Write neatly - think about the grader!

1) Full Moon

1. At what time of day does the full moon rise? ______________________
2. When is the full moon highest in the sky? ________________________
3. Where in the sky is the Sun when the full moon sets? _______________________
4. The next full moon is on September 28^th. The Moon will be in the constellation Pisces. On that day, in which constellation will the Sun be? (Hint: Figure 1.19) ____________________

2) Which Phase? In the diagram below:

1. Where is the Sun? Draw & label it on the figure below.
2. What approximate time of day is it at the time of the figure? _____________________

(c) Where will the moon be and look like at the same time 1day later? Draw & label it.

(d) In how many days will the Moon be full? __________________________________

1. The Copernican revolution did not take place overnight. From reading Chapter 6, how long would you say it took, approximately? ___________________________________________
2. In which of the main ingredients of the scientific method (insert on page 42) did Tycho "No Nose" Brahe make a significant contribution? ______________________________________
3. Central to the Copernican revolution was the issue of the retrograde motion of Mars. From looking at figure 3.7, estimate over what period of time you need to observe Mars to observe a cycle of retrograde motion. ____________________________________________________

4) Check out the Foucault Pendulum in the window of the Gamow Tower (opposite the Ralphie statue). Look at at 2 different times of day.

(a) which way did the pendulum rotate? Clockwise / Anti-clockwise

(b) What does this tell us about the Earth? ___________________________________________

5) Check out the Norlin Sundial outside the Norlin library (east side).

(a) Which side can we use to read the time? (hint: when is fall equinox?) _____________________________________________________________

(b) What time do you read? _______________________

(c) Which way does the shadow go around the sundial face? Clockwise / Anti-clockwise (c) WHY do we need to use the other side at other times of the year? _______________________

6) Check out the 2 globes of the Earth made out of granite on the south side of the Geology Building (east of Duane, west of Math building).

(a) The Earth in the 'sculpture' has a spin axis that is incorrect - it is not pointing in the same direction as the real Earth's spin axis. Where should the sculpture's axis be pointing if it were to accurately represent the orientation of the Earth as we are standing on it here in Boulder? Describe carefully. Draw a diagram. (Hint: the ground that you are standing on is pretty horizontal - look at the map of the US - when Boulder spins round to the top of the globe, will the US be horizontal? Where is the globe's spin axis pointing?)

(b) The sculpture is oriented in a way that is the same as most globes (with a stand) that you buy in a store. What is the perspective that is assumed with such globes? Think of a globe as a small model of part of the solar system. Where are you standing in space when you are looking as such a globe sitting on a table? (Hint: think about the spin axis of the globe, the equator and how the Earth moves in space)

(c) If you were commissioned to add to the globe sculpture of the Earth (leaving it in the current orientation) - where would you put the orbit of the Moon to be accurate from the perspective you have described in (b)? How big would be the Moon in the sculpture and where would be the Moon's orbit?

7) Inferior Planets. As demonstrated in the planetarium, the 2 "inferior planets" (because they are closer to the Sun than the Earth) Mercury and Venus always stay relatively close to the Sun. This means we can only see them close to sunset and sunrise. The diagrams below show the APPARENT and ACTUAL locations of Mercury and Venus when they appear farthest from the Sun in the sky — at greatest elongation. By measuring the angle of greatest elongation and using some simple geometry, we can determine the distance of a planet from the Sun (relative to the Earth’s distance to the Sun — the astronomical unit — AU). Using Venus's angle of greatest elongation, 46°, work out the distance of Venus from the Sun in AU. No grade for just a number even if it is correct — the process is just as important.