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Parallax Activity Per: ___ Name/Group: _____________________ Question: How does the distance to an object affect its apparent movement? Hypotheses: The closer the object is, _________________________________ Procedures: (Simple Parallax) 1) Measure the distance from the “Sun” to the #4 position of Mars, Jupiter, and Saturn. Plot and label their positions on the grid. (Each floor tile is 1 foot by 1 foot) 2) Plot and label the #2 and #6 positions of Earth on the grid, as well. 3) Draw lines from the #2 position of Earth through each planet to the stars on the grid. Also, record the apparent position of the planets on the Star Map. (Have Mr. Carr check work.) 4) Repeat step 3 from the #6 position of Earth, but with a different color. Stars Sun Mars Star Map P O N Jupiter Star Map P O N Saturn Star Map P O N M L K J I H G F E D C B A M L K J I H G F E D C B A M L K J I H G F E D C B A What is the relationship between distance from Earth and the amount of shift seen? (Give the shifts for each planet knowing that the letters are 2 feet apart.) __________________________ ____________________________________________________________ ____________________________________________________________ What is unrealistic about the motion of the planets compared to the motion of the Earth? ____________________________________________________________ ____________________________________________________________ Procedures: (Retrograde Motion) 5) Plot positions #1-8 for Earth and Jupiter on the grid. Connect the dots to make an orbit. 6) Draw lines from Earth through Jupiter to the stars for each pair of positions. 7) Record Jupiter’s apparent positions on the star map. (Number the positions and connect with dots with arrows.) (Have Mr. Carr check work.) Stars Sun Star Map of Jupiter’s Motion (over roughly an 8.3 month period of time) P O N M L K J I H G F E D C B A Follow up Questions 1. Looking from Earth towards Jupiter, what direction is Jupiter moving in reality? Left or Right 2. Going from which position to which position does Jupiter appear to move to the right? ____ 3. Going from which position to which position does Jupiter appear to move to the left? _____ 4. When is Jupiter’s apparent motion backwards compared to reality? ________________ 5. Why is Jupiter’s apparent motion sometimes backwards/retrograde compared to reality? ________________________________________________________ ________________________________________________________ 6. How many months pass between positions 2 and 6 for Earth? How do you know this? ________________________________________________________ ________________________________________________________ 7. How does retrograde motion prove Earth is not the center of the Solar System? (Hint: Repeat the experiment, but have only Jupiter move, NOT Earth.) _____________________ ________________________________________________________ ________________________________________________________