What is "seeing"?
A) a measure of the quality of the telescope's optics
B) a measure of the transparency of the scope's objective lens
C) a measurement of the sharpness of vision of the astronomer's eyes
D) a measurement of the image quality due to air stability
E) a measurement of clarity and absence of clouds
D
You might also like to view...
The lowest amount of solar energy per square meter is incident upon the surface of Earth in the northern hemisphere on or about
a. December 21, the winter solstice. c. September 21, the autumnal equinox. b. March 21, the vernal equinox. d. June 21, the summer solstice.
Double-lobed radio galaxies are an effect of black hole jets
a. True b. False Indicate whether the statement is true or false
To totally convert a given amount of mechanical energy into heat is
A) possible. B) impossible. C) need more information D) none of the above
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The velocity
a. is zero. b. has its largest magnitude. c. points up. d. points down.