Whole of them can be put together and tightened in book with the help of book-binder machine. the thickness is noted by slide calipers the figure divided by the number of sheet given the answer on thickness of each paper

Autonomous take usage of parallax to find distance between object much farther even than planets. To calculate the distance to a star, astronomers observe it from different places along earth orbit around the sun

By intensity of light from sun directly and that of light reflected by moon. At the time of eclipse, we can find the distance between earth and sun and distance between earth and moon then we subtract or add to get the distance Using the lunar year, earth year and distance between earth and moon