Kepler's Laws
Health Warning! This is not necessarily everything you need to know from this lecture! I maintain exactly what you need to
know through the first few lectures as some people add the course late. But these questions are to help with just the most difficult concepts in
some lectures. If you want to discuss any of these concepts more, come see me during office hours.
Here is a useful link to help explain why retrograde motion is important in distinguishing heliocentric and geocentric models.
Who was Ptolemy and what was his model?
Who was Copernicus and how did his model differ from Ptolemy's?
Who was Tycho Brahe and why was he important to our understanding of planetary motion?
Who was Johannes Kepler and how did his model differ from Copernicus'?
What are Kepler's 3 laws and what are their implications? Do planets move faster or slower when they are closer to the Sun? How fast do outer planets move compared to inner planets? Do the planets move in perfect circles?
Why are oppositions and superior and inferior conjunctions important to our understanding of planetary motion?
Why is retrograde motion important to our understanding of planetary motion?
Which of the following alignments depicts superior conjunction, which depicts inferior conjunction and which depicts opposition?
(i) Planet Earth Sun
(ii) Earth Sun Planet
(iii) Sun Planet Earth
Which of the following alignments depicts superior conjunction, which depicts inferior conjunction and which depicts opposition?
(iv) Earth Planet Sun
(v) Sun Earth Planet
(vi) Planet Sun Earth
In Ptolemy's geocentric model, when a planet is displaying retrograde motion is it closer to are farther from the Sun than is typical?
In Copernicus' heliocentric model, when a planet is displaying retrograde motion is it closer to are farther from the Sun than is typical?
In Ptolemy's geocentric model, when a planet is displaying inferior conjuction is it closer to are farther from the Sun than is typical?
In Ptolemy's geocentric model, when a planet is displaying inferior conjuction is it closer to are farther from the Earth than is typical?
In Copernicus' heliocentric model, when a planet is displaying opposition is it closer to are farther from the Sun than is typical?
In Copernicus' heliocentric model, when a planet is displaying opposition is it closer to are farther from the Earth than is typical?
In Ptolemy's geocentric model, which planets can display superior conjunctions?
In Ptolemy's geocentric model, which planets can display inferior conjunctions?
In Ptolemy's geocentric model, which planets can display oppositions?
In Copernicus' heliocentric model, which planets can display superior conjunctions?
In Copernicus' heliocentric model, which planets can display inferior conjunctions?
In Copernicus' heliocentric model, which planets can display oppositions?
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