The mean distance between the earth and the sun is:

The mean distance between the earth and the sun is: 

A. 1 parsec 
B. 4.3 light years 
C. 1 astronomical unit ( AU ) 
D. 1 celestial unit


Answer:   C. 1 astronomical unit ( AU ) 

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Question:


One complete turn of the drum of the sextant moves the index arm along the arc is equal to: 

A. 1 degree 
B. 1/10th of a degree 
C. 1 minute of arc 
D. 1 second of arc



Answer:  A. 1 degree 

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Question:


Out of the 57 navigational stars tabulated in the Nautical Almanac, how many are of the first magnitude? 

A. 6 
B. 19 
C. 21 
D. 23



Answer:  B. 19