On one hand, to be able to go from one direction in the sky to study such an object to another direction to study another object, and on the other hand to be...

On one hand, to be able to go from one direction in the sky to study such an object to another direction to study another object, and on the other hand to be able to maintain accurately the position in space.

quote by Claude Nicollier
Submitted by Lucian Velea
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