# Physics Lab #2:! Starry Night Introduction!

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3 Lab #2 Worksheet Name: Home TA: After you have read Changing your viewing direction and Changing the date and time, answer the following questions: Look toward the Western horizon and set today s time to 430pm. -- After you have read through Identifying objects in the sky, answer the following: Look toward the Northwestern horizon and set the time to 11pm, then turn on labels using the L key on your keyboard. What type of object is M82? What type of object is M37? -- After you have read through Displaying constellation figures and Finding an object, answer the following: Set the time to 4am today. Use the Find tab on the sidebar to find the planet Saturn, then center on it. In what constellation is the Sun located? At what time does the Sun set tonight? How far is the bright star Castor from Earth? In what constellation is Saturn found? Set the time to 7pm today, then use the Find tab to find and center the planet Jupiter. In what constellation is Jupiter found? 11

4 If you have used the Find sidebar to find and automatically center on Jupiter, then the altitude and azimuth of Jupiter should appear on the top information bar near the right hand side of your screen. Read through zooming in on an object in the SkyGuide sidebar, then zoom in on Jupiter and answer the following. Which of Jupiter s moons casts a shadow on Jupiter at this time (7pm)? If none do, you can just say that. What is the altitude of Jupiter above the horizon? Use the search option in the Find sidebar to find the Pleiades open cluster. In what constellation is the Pleiades found? Name three of the seven sisters that make up the Pleiades (Atlas and Pleione are the parents, they don t count). -- Now we re done with the sky guide, but we will still explore a few more features of Starry Night. Set the time and date to 8pm Feb 14, 2011, then scroll around the sky to locate and center on the Moon (in what general direction should the full moon be just after sunset?) Open the info tab in the sidebar, and use it to answer the following:,, In what constellation is the Moon? What is the Moon s phase? -- Use the Now button just beneath the clock on the top left information bar to return to today s date and time. Use the find sidebar to find and center on the Sun, then open up the info tab. 12

5 What is the declination of the Sun, to the nearest degree? Click on the sunset button below today s date and time in the top information bar, then just beneath the time flow rate indicator, click the stop button. You should now be looking at the Western horizon with the Sun hidden behind the scenery. For simplicity, let s remove the trees and scenery. Under the options menu, select Other Options --> Local Horizon. On this screen, select Flat for Horizon style. You should now be able to see the Sun as it is setting below the horizon. What is the Sun s azimuth, in degrees? If West is 270, how many degrees South of West is this? -- Now set the date to the vernal equinox, March 20 and the time to sunset. What is the Sun s azimuth, in degrees? -- Now set the date to the summer solstice, June 21 and the time to sunset. What is the Sun s azimuth, in degrees? How many degrees North of West is this? Such precise measurements are key to understanding the alignments of ancient skywatching sites such as Stonehenge. Return to today s date and time and look due North. Now in order to see circumpolar motion, we will increase the rate time flows. On the top information bar, change the time flow rate to 3000x. Name a bright star in Ursa Major that is circumpolar, which means it always remains above the horizon. 13

6 Now use the top information bar under Viewing Location to switch your location to Singapore (under Other... ). You should stop the time flow so we can set the time. What is the altitude of Polaris above the Northern horizon at 930am on today s date? Remember, you can get this information in the info tab. -- Now we will track the Sun s motion. Use the home button below Viewing Location to return to Fort Worth. This also returns us to today s date and time. For reference now, we will turn on the meridian on the screen. Under the View menu, look for the sub-menu Alt/Az guides and select Meridian there. Now adjust today s time until (looking South) you see the Sun cross the meridian. When then Sun crosses the meridian, it is at its highest point in the sky. When the Sun is on the meridian today, what is its altitude above the Southern horizon? Based on the rise and set times, what is the day length to the nearest hour? On March 21, what is the Sun s altitude when it is crossing the meridian? On June 21, what is the Sun s altitude when it is crossing the meridian? Based on the rise and set times, what is the day length to the nearest hour on June 21? 14

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