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### Continguts

 CHAPTER 1 CHAPTER II 25 CHAPTER III 43 CHAPTER IV 69 CHAPTER V 82 CHAPTER VI 103 ATMOSPHERIC REFRACTION 116 questions on refraction 140
 CHAPTER XII 277 CHAPTER XIV 312 CHAPTER XV 326 CHAPTER XVI 346 CHAPTER XVII 358 CHAPTER XVIII 376 CHAPTER XIX 383 CHAPTER XX 407

 CHAPTER VIII 171 CHAPTER X 226 CHAPTER XI 248
 Chapter XVII 431 OBSERVATORY 458 INDEX AND GLOSSARY 493

### Passatges populars

Pŕgina 147 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Pŕgina 146 - LAW I. Every body continues in its state of rest, or of uniform motion in a straight line, except in so far as it may be compelled to change that state by impressed forces.
Pŕgina 299 - The squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.
Pŕgina 146 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Pŕgina 425 - Up to now we have been explaining to the best of our ability the revolutions of the Earth around the sun and of the moon around the Earth.
Pŕgina 4 - III., when two sides and an angle opposite to one of them are given...
Pŕgina 13 - A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B...
Pŕgina 13 - Triangle to equations (I) they become t sin.- A cos. b = cos. B sin. C + sin. B cos. C cos. a ; I sin. A cos. c = cos. C sin. B + sin. C cos. B cos. a. sin. B cos. c = cos. C sin. A + sin. C cos. A cos.
Pŕgina 146 - To every action there is always an equal and contrary reaction ; or, the mutual actions of any two bodies are always equal and oppositely directed in the same straight line.
Pŕgina 1 - C = cos. c sin. a — sin. c cos. a cos. B ; I sin. b cos. A = cos. a sin. c — sin. a cos. c cos. B. i sin. c cos. A = cos. a sin.