WEEK 2 Review Questions 1 How many degrees is 30 arc minutes To an astronomer 1

Week 2 review questions 1 how many degrees is 30 arc

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WEEK 2-Review Questions
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1. How many degrees is 30 arc minutes? To an astronomer 1 o is a large angle. A 1 o angle can be subdivided in to 60 equal parts. So 1 o = 60 arc minutes and 1 (minute) of arc can be divided again into 60 equal parts- 1 = 60 arc seconds. 30 arc minutes = ½ degree. 1 degree = 3,600 arc seconds 2.* Describe one technique involving celestial observations that our ancestors used to establish the passage of the year. Explain in detail, a drawing would be helpful, how the beginning and ending of the cycle was determined. See power point-Solar Sightings… For this I chose the location of the rising and setting sun. For example, starting in summer the sun moves (at rising) from north of east to directly east, and then to south of east. After reaching its southernmost rising point it heads back to where it started. At the conclusion of the cycle is one year. The beginning and ending are arbitrary and based on when our ancestors decided the cycle began. They could decide to start keeping track at either the southernmost rising point of the sun or the northernmost rising point. They could also start the cycle when the sun is at the equinoxes and directly east. The June Solstice sun also casts a unique noon shadow so one could mark the time between it successive appearances. By observing the constellations that would become known as the zodiac, an observer is able to see the initial zodiacal constellation chosen (by that observer) as a marker returns to the same location in the sky one year will have passed. 3.*If the sun rises in the southeast, what date is it? See power point- Solar Sightings 4. As seen in the Northern Hemisphere, on which dates will the sun cast the shortest noon shadow? Noon is the time when the sun is at its highest altitude, therefore the shortest shadow of the day will be cast. Try experimenting with a flashlight and a pencil stuck into an eraser… 5. Which shadow plot (A or B) most closely corresponds to the Suns path through the sky during summer? At the June Solstice the sun rises in the northeast. Shadow plot “B” is the correct choice.
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1 / 1 point What month of the year do we see the sun highest above the horizon in Minnesota? December March June September Question 2 1 / 1 point What season are we starting when we see the sun highest in the sky? Winter Spring Summer Fall Question 3 1 / 1 point When is the altitude of the noon sun lowest in the sky? December
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March June September Question 4 1 / 1 point What season are we starting when we see it lowest? Winter Spring Summer Fall Question 5 1 / 1 point How long does it take the sun to change its position from highest to lowest? One month Three months Six months One year Question 6 1 / 1 point Does the sun appear to get a little higher or a little lower each day during the season of summer?
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