AST - Mininger Lucas - Module8 Assignment The Phases of Venus

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Feb 20, 2024

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Phases of Venus – Exercise Materials - Student Name: Lucas Mininger 1. Exercise Activities Step 1. A. Start Stellarium. It should be in the default configuration you setup in the Using Stellarium exercise. You should be viewing to your South and set the program to full screen. B. Use the Date/Time Window to set the date to 2010/1/10 and the time to 17:00:00 and leave the Date/Time Window in the upper right hand corner of the screen. Set the FOV to between 30 ° and 35 ° . C. Move the horizon until the West compass mark is on the far right side of the screen. Keep the horizon low on the screen. You are now facing Southwest just prior to sunset during a Superior Conjunction of Venus and therefore Venus is in a Full Phase (Venus appears very close to the Sun). D. Now use the Search Window to locate Venus. E. Now turn off the atmosphere and the landscape. Step 2. A. Zoom into to a FOV of about 0.03° . You can see that, viewed from Earth, Venus is fully illuminated. B. Use the Date/Time Window to advance the date by four months. Leave the Window up in the upper right corner. ■ Question 1: What is the general phase of Venus at this point? 42 degrees 48’ 14.8’’ ■ Question 2: If you noticed any other change(s) in Venus' appearance, describe it/them. Its dark on the left side, similar to how the moon looks sometimes ___________________________________________ A. Advance the time by five months. you should be at 2010/10/10 . ■ Question 3: What is the general phase of Venus at this point? 142 degrees 00’ 55.4’’ ■ Question 4: You should now notice a significant change in Venus' appearance, can you describe it? It looks the opposite as before. Similar to a toenail _______________________________________________________ ■ Question 5: Can you explain why this change in appearance has taken place? The view from earth is changing over time because venus is orbiting and reflecting the sun differently _______________________________________________________ A. Continue to advance the time in one month intervals until Venus is in Full Phase. ■ Question 6: How many months have you advanced since you started the exercise? 9 ■ Question 7: What is this time in years (divide the number of months by 12 to get decimal years)? .75 _______________ ■ Question 8: What is this time in days (multiply the number of decimal years by 365.25 to get decimal days)? 273.9375 _______________ ■ Question 9: Is this the Orbital Period, or the Synodic Period? sydonic Period Step 3. A. Use the Date/Time Window to reset the date to 2010/1/10 and the time to 17:00:00 . B. Using the Location Window, set the location to "Solar System Observer". You are now looking down on the plane of the Ecliptic. From here we can observe the orbits of the inner planets C. Use the Search Window to select the Sun.

D. Note the current position of Venus relative to the Sun ■ Question 10: What is the term for the currently set relationship between the Earth, Sun and Venus? Superior conjunction ______________________________________ A. Now use the Date/Time Window to advance the date by one month. B. Notice that as you advance the time, that all the planets move, not just Venus. C. Now continue to advance the date in one month increments until the Sun, Earth and Venus are once again close to alignment. ■ Question 11: What is the term for the currently set relationship between the Earth, Sun and Venus? Inferior conjunction ______________________________________ ■ Question 12: About how many months did you advance to get to this configuration? 10 ____________________ A. Use the Date/Time Window to reset the date to 2010/1/10 and the time to 17:00:00 . B. Again, note the position of Venus. C. Advance the date in one month increments until Venus returns to a point close to the same location (relative to the Sun), but just past. D. Now backup one month. ■ Question 13: About how many months did you advance to get to this configuration? (it will be between two months, so just use the half month in between, e.g. between 1 and 2 would be 1.5 months, etc.) 7.5 ____________________ ■ Question 14: How many years (in decimal) did it take for this period (divide the number of months you got by 12)? .625 ____________________ Step 4. A. Using the actual values for Venus: ■ Orbital = 0.62 years ■ Synodic = 583.92 days and using Equation 1. to calculate % error. A. Question 15: What is your percent error for the Orbital period? .005 B. Question 16: What is your percent error for the Synodic period? 53% 1. Exercise Materials ((Measured value - Actual value)/Actual value) x 100%

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