Double star is a pair of stars that appear near each other on the celestial sphere.
No one wanted to pay for music; the general feeling was that it should flow free from the celestial spheres.
In the field of astronomy, the sky is also called the celestial sphere.
The image is such that the upper left corner points toward north (-46.4 ) on the celestial sphere.
During the mission, the instrument could sample half the celestial sphere each day.
This means that the celestial sphere and the earth have the same centre.
The reason for this is that the Sun does not stand still on the celestial sphere, and the stars do.
"The numbers come in on the celestial spheres and I add them up."
This was the first atlas to cover the entire celestial sphere.
It was only the northern half of the celestial sphere which had been fully explored.