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.

We find in the other celestial bodies abundant evidence of the present or the past existence of heat.

The argument on which we are to base our researches is really founded on a very familiar phenomenon.

To my friend Dr. Arthur A. Rambaut I owe my hearty thanks for his kindness in aiding me in the revision of the work.

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Many of the earliest discoveries are indeed prehistoric.

Ptolemy commences with laying down the undoubted truth that the shape of the earth is globular.

The great astronomer had just reached manhood at the time when Columbus discovered the new world.

On Tycho's death, which occurred soon after, an opening presented itself which gave Kepler the opportunity his genius demanded.

The first exhibition of Bradley's practical skill seems to be contained in two observations which he made in 1717 and 1718.

The long tenure of the chair of Astronomy by Brinkley is divided into two nearly equal periods by the year in which the great circle was erected.

The first systematic piece of practical astronomical work which John Herschel undertook was connected with the measurement of what are known as "Double Stars."

Lord Rosse was endowed by nature with a special taste for mechanical pursuits.

One of his most interesting researches in these early days is on the subject of Astigmatism, which defect he had discovered in his own eyes.