# AST101Ch1Lab2 - Astronomy 101 Online Lunar Phases and...

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Nate Christensen Lunar Phases and Eclipses Lab Introduction : Your project for the semester involves tracking the phases of the Moon to determine what is known as the synodic period or the time it takes the Moon to go through all of its phases. In this lab, you will use Starry Night and an animation on the web to reinforce what you learned in the lessons, seeing how the different lunar phases relate to the positions of the Earth, Moon, and Sun. We'll also use Starry Night to look at some simulated eclipses. Procedure : Start up Starry Night. Open the "Find" dialog box to find the list of objects in the solar system. Double-click on the sun to center and lock it (allow Starry Night to change the time, if necessary). Use the pull-down menu next to the sun entry and select "Go There". You should now find yourself at 0.019 au from the Sun (recall that an au is an Astronomical Unit, where the average distance from the Earth to the sun is 1 au). Double- click on Earth in the Planets List to center and lock on to Earth (again, allow Starry Night to reset the time if it needs to). Zoom in until the field of view is 1' x 1' (1' = 1 arcminute, 1/60 of a single degree). Notice that the time is now expressed in UT - universal time. UT is the time in Greenwich, England, the location of the Prime Meridian. Set the time to 18:00 UT and hit the stop button. 1 . Which part of the Earth is experiencing daylight? (Give a geographical description.) The Western Hemisphere 2 . For which part of the Earth is it night? The Eastern Hemisphere 3 . What time is it in Illinois (valid choices here are "midnight", "sunrise", "noon", or "sunset")? Noon 4 . What time is it in Mandalay, Burma (almost exactly on the opposite side of Earth from Illinois; use the same choices as in question 3)? Midnight Set the time step to 3 minutes. Click on the play button and watch the Earth. 5 . With the north pole near the top of the image you see, is the Earth rotating clockwise or counter-clockwise? Counter-clockwise 6 . What time of day is it at each of the positions a, b, c, and d in the figure at the right? Use the terms "midnight", "noon", "sunrise" and "sunset". Assume that you are looking down at the north pole of the Earth. A. Sunset

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AST101Ch1Lab2 - Astronomy 101 Online Lunar Phases and...

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