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according action angle appears arising atmosphere attraction axis becomes bodies called cause changes chemical circumstances color comet consequently continued dark depends determined diameter diminishes direction distance disturbing earth ecliptic effect electricity equal equator existence experiments extends extremely fall fluid force give given glass gravitation greater heat increase influence instance intensity known latitude length less light liquid magnetic mass matter mean measured metal miles moon motion move nature nearly NOTE object observations opposite orbit particles passing period phenomena planet plate polarized poles position probably produce proportion proved quantity rays reflected refraction revolving rings rotation round satellites seen separated side similar solar solid sound space spectrum square stars substances surface take place temperature terrestrial theory tion transmitted variation varies vibrations waves whole wire
Page 395 - The squares of the periodic times of the planets are proportional to the cubes of their mean distances from the Sun.
Page 398 - The circumference of every circle is supposed to be divided into 360 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds, and these into thirds, fourths, &c.
Page 88 - ... there is a meridian about 30° eastward of the moon, where it is always high water both in the hemisphere where the moon is and in that which is opposite. On the west side of this circle the tide is flowing, on the east it is ebbing, and on every part of the meridian at 90° distant it is low water.
Page 363 - Jupiter ; it then gradually diminished in splendour, and after exhibiting all the variety of tints that indicates the changes of combustion, vanished sixteen months after its discovery without altering its position. It is impossible to imagine anything more tremendous than a conflagration that could be visible at such a distance.
Page 421 - Whatever the reflecting surface may be, and however obliquely the light may fall upon it, the angle of reflection is always equal to the angle of incidence.
Page 2 - Equally conspicuous is the goodness of the great First Cause, in having endowed man with faculties by which he can not only appreciate the magnificence of His works, but trace, with precision, the operation of his laws; use the globe he inhabits as a base wherewith to measure the magnitude and distance of the sun and planets, and make the diameter of the earth's orbit the first step of a scale by which he may ascend to the starry firmament.
Page 288 - ... were distinctly visible. Day broke very slowly and the sun rose of a fiery and threatening aspect. Rain followed. Captain Bonnycastle caused a bucket of this fiery water to be drawn up: it was one mass of light when stirred by the hand, and not in sparks as usual, but in actual corruscations.
Page 296 - ... in each case. The appearances are so different that, by this mode of examination, the metals may be readily distinguished from each other.
Page 2 - ... the most extraordinary conclusions have been arrived at, — is within the reach of many who shrink from the task, appalled by difficulties, which, perhaps, are not more formidable than those incident to the study of the elements of every branch of knowledge.