Alternate Format: Video Instructions

• Follow along with this tutorial video

Alternate Format: Written Instructions

1. Set the graphing page to “Venus”
2. Copy and paste your data into the table for the graph
   • If it shows an error:
     • Check that you have only numbers and no units in the data.
     • Overwrite all existing data on the graphing page
     • Check that your decimal places look correct (just one numeral after the decimal point)
     • Check that your phase numbers are all between 0 and 1
3. Label your graph
   • Label your X axis, which is showing angular diameter in arcseconds
   • Label your Y axis, which is showing the phase (no units)
   • Title your graph.
     • Hint: what is your graph comparing?
4. Download your graph and insert it into the Skynet 3 Observation Report
   • On the bottom middle there is a button “Save Graph”
5. Compare your graph to the provided models to answer whether we live in a heliocentric universe or a geocentric universe.
   • If the data points are mostly near the red line, we live in a heliocentric universe (the Sun is the center of the solar system and the planets orbit the Sun)
   • If the data points are mostly in the blue area, we live in a geocentric universe (the Earth is the center of the solar system, and all the planets, the Sun, and the Moon all orbit around the Earth.)
   • 
   • Record your answer