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.
-- Claude Nicollier
   
Claude Nicollier   Name:
Claude Nicollier
Type:
Astronaut
Nationality:
American
Birth:
September 2, 1944
https://www.nutquote.com/quote/Claude_Nicollier