1) On a clear night, look at the constellations, or patterns of stars, in the no
ID: 3278903 • Letter: 1
Question
1) On a clear night, look at the constellations, or patterns of stars, in the northern and southern skies. Make careful sketches to help you remember their locations with respect to the horizon. Check back a few hours later (the longer you wait, the better). How have the constellations in the northern sky moved? How have the constellations in the southern sky moved? What are your findings?
2)Your thumb at arm's length subtends about one degree. (There is some variation from person to person, but people with bigger thumbs tend to have longer arms and vice versa, so these differences tend to cancel out.) Using your thumb, measure the angular size of the moon and check to see if the textbook is right. What are your findings?
Explanation / Answer
1.
nothern sky
stars appear to rise from the north-east and move along a counter clockwise direction .Then reaches high above the northern sky and along that counter clockwise path sets in the northwest
souther sky
In sothern sky the stars rise from east but they rise and move along curved path not straight path.The stars after reaching high in the sothern sky sets in the west.
Findings:
In the the southern hemisphere stars move from east to west in curved path this must be due to the rotation of the earth.
In the northern hemisphere stars appear to move in counter clock wise pattern this must be due to the tilt of the earths rotation axis and the rotation of the earth .
2.when I used thumb to find the angular size of the moon ,I found that the angular size of my thumb is bigger than angular size of the moon.It was almost half the angular size of the thumb finger so it must be less that 1 degree .So it must be about half a degree.
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