celestial worksheet turn in.doc

celestial worksheet turn in.doc - PHYS 1403 Lab 3 THE...

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PHYS 1403 Lab 3: THE CELESTIAL SPHERE II Worksheet Enter your answers to each question in the data tables and yellow highlighted areas below. When completed, please save the file and upload it to the assignment – Lab 3 – in Canvas. PRELAB QUESTIONS 1. What causes the seasons? The earths tilt either toward or away from the sun as it travels on its path. 2. How long would nighttime be on Sep 22 if you were standing directly on the Arctic Circle? 12 hours 3. If the longest daytime of the year is on the summer solstice, why are the hottest days of the year about six weeks later? Seasonal delay due to the ground taking time to warm up. 4. What is the vernal equinox? The Spring Equinox that takes place during the month of March. 5. How can it be true that half the Earth is in light all the time, if during the winter some part of the northern hemisphere is in 24-hour darkness? This is true because at the same time thatthe north pole is in 24-hour darkness, the south pole is experiencing 24-hour sunlight. 6. Why are shadows longer in winter? Shadows are longer in the winter because of the tilt of Earth’s axis during this time makes the Sun low in the sky. EXERCISE In this exercise you will be using Stellarium in order to familiarize yourself with the celestial sphere. Start the program (just as you did in Lab 2. If for some reason you did not do Lab 2, see the Lab 2 worksheet for instructions on starting up Stellarium), you should see a scene representative of the sky conditions outside. If it is still daylight outside, you will see daylight on your computer screen; and if it is night outside, you will see night on your computer screen. Since, in this lab, we are interested in what the sun 1
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