Is it possible to see a waxing crescent moon on the overhead meridian at 10 A.M. local time? How about at 4 P.M. local time? Explain your answers
A waxing crescent moon cannot be observed on the overhead meridian at 10 A.M.
local time but can be seen on the overhead meridian at 4 P.M. The waxing crescent
moon begins as the new moon ends (12 noon local solar time), continues for 7 3/8
days, and ends at the time of the first-quarter phase of the moon. Because the new
moon occurs at 12 noon local solar time, and the first quarter at 6 P.M., the waxing
crescent can be seen on the overhead meridian between these two times.
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Fill in the blank(s) with the appropriate word(s).
What is the main sequence?
A. a region of cool, luminous stars in the upper right corner of the H-R diagram B. a region of hot dim stars in the lower left corner of the H-R diagram C. the order in which spectral types are listed D. an approximately straight line on the H-R diagram along which 90% of stars lay
What period of Earth's geologic history saw a dramatic increase in life?
a. Cretaceous b. Devonian c. Jurassic d. Tertiary e. Cambrian
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A) 24.0 m B) 9.00 m C) 19.5 m D) 4.50 m E) 15.0 m