Jupiter also turns on its axis, and Jupiter again, like the earth, might turn either with the sun or it might turn in the opposite direction.

The detection of the attendant of Sirius, and the measures which have been made thereon, enable us to determine the weight of this famous star.

No one will deny that there are points in connection with the nebular theory which present difficulties which to some seem important.

One of the finest binary stars is that known as Castor, the brighter of the two principal stars in the constellation of Gemini.

In the beginning of the evolutionary history the sun was a nebula, which we have supposed to extend in every direction to an indefinitely great distance

No attempt to solve the problem of the absolute distances of the stars was successful until many years after Herschel's labours were closed.

Your next lesson will be to utilize the Great Bear for the purpose of pointing out the Pole Star.

The most striking type of star cluster is well exhibited in the constellation of Hercules.

The study of the spectra of the fixed stars made hardly any progress until the principles of spectrum analysis had been established by Kirchhoff in 1859.

The position of the pole of the heavens is most conveniently indicated by the bright star known as the Pole Star, which lies in its immediate vicinity.