. . . a large asteroid or comet was on a direct collision course with the Earth? What would it look like in the eyepiece? How could the casual observer see that something has a constant bearing and ever decreasing range when our observing platform (Earth) is spinning? How would it's movements differ from those of the stars and other celestial objects in the night sky?
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I have several telescopes, but none are semi-APO, APO, or in anyway valuable.
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