Questions for review:

4. what is parallax and how is it measured?

5. where on the celestial sphere would you look for the planets?

9. what are the three laws of planetary motion?

Thought questions:

3. Tycho argued that the sun orbits earth but that the other planets orbit the sun. could tycho's model explain the phases of Venus as observed by Galileo? Why?

4. Which of Kepler''s laws explains why the Sun has a slightly larger angular diameter in january than in July?

Problems:

3. One average, Mercury is 0,387 times Earth's distance from the Sun, and Pluto is 39,53 times Earth distance from the Sun. If the sun has an angular diameter of 0.5^0 as seen from Earth, what is the sun's angular diameter as seen from mercury? From Pluto?

6. In 2003, astronomers discovered sedna, an object in the outer solar system with a semimajor axis of about 526 AU. What is its orbital period?

Bonus question:

How could the statement "Newton was born in the year Galileo died" be contrived to be technically true?

Why is it actually not true?