Under its Charter, the first stated aim of the U.N. was ______.

A．A fixed star refers a star that is always stationary on the sky.
B．Scientists can tell the motion of the earth from the motions of other five planets.
C．Ancient people had scanty knowledge about the movement of the stars.
D．All the stars on the sky can be seen all the year around.

A．the sun is so distant from us that it was hard to follow its motion
B．the sun was moving westward around the sky
C．the motion of the sun is at the rate of about thirty degrees every week
D．the motion of the sun is similar to the revolution of the earth around the sun