Answer:
1.rotations
of the earth is its turning on its axis.
2.revolotion
is the movement of the earth around the Sun.
3.A reference point is a place or object used for comparison to determine if something is in motion.
4.three optical effects of motion are know at the present time,namely,(i) astronomical abberration,discovered by bradley in 1728; (2) the Doppler effect expressing the dependence of the wave lenght of light on the relative motion of a source and observer;(3) the effect of the carrying along of light by motion
Explanation:
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