Letters on Astronomy, in which the Elements of the Science are Familiarly (!) Explained in Connection with Biographical Sketches of the Most Eminent AstronomersHarper, 1855 - 427 |
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Strona 6
... Moon . - Phases . - Harvest Moon . - Librations ,. 172 LETTER XVII . Moon's Orbit . Her Irregularities , 180 LETTER XVIII . Eclipses , 195 • LETTER XIX . Longitude . - Tides , 208 LETTER XX . Planets . - Mercury and Venus , 225 LETTER ...
... Moon . - Phases . - Harvest Moon . - Librations ,. 172 LETTER XVII . Moon's Orbit . Her Irregularities , 180 LETTER XVIII . Eclipses , 195 • LETTER XIX . Longitude . - Tides , 208 LETTER XX . Planets . - Mercury and Venus , 225 LETTER ...
Strona 32
... moon , ) is inserted a convex lens , L , which receives the rays of light from the moon , and collects them into the focus at a , forming an image of the moon . This image is viewed by a magnifier attached to the end BC . The lens , L ...
... moon , ) is inserted a convex lens , L , which receives the rays of light from the moon , and collects them into the focus at a , forming an image of the moon . This image is viewed by a magnifier attached to the end BC . The lens , L ...
Strona 39
... moon , for example , not only bright and distinct , in all its parts , but they take in the whole disk at once ; whereas , the inferior instruments , when the higher powers , especially , are ap- plied , permit us to see only a small ...
... moon , for example , not only bright and distinct , in all its parts , but they take in the whole disk at once ; whereas , the inferior instruments , when the higher powers , especially , are ap- plied , permit us to see only a small ...
Strona 41
... moon , another for Jupiter , and a still higher power for Saturn . Comets require only the lowest magnifiers ; for here , our object is to command as much light , and as large a field , as possible , while it avails . little to increase ...
... moon , another for Jupiter , and a still higher power for Saturn . Comets require only the lowest magnifiers ; for here , our object is to command as much light , and as large a field , as possible , while it avails . little to increase ...
Strona 58
... moon and a certain star , -the moon being at M , and the star at S. The instrument is held firmly in the hand , so that the eye , looking through the telescope , sees the star , S , through the transparent part of the horizon glass ...
... moon and a certain star , -the moon being at M , and the star at S. The instrument is held firmly in the hand , so that the eye , looking through the telescope , sees the star , S , through the transparent part of the horizon glass ...
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angle appear ascertain astronomers atmosphere attraction axis called celestial celestial sphere centre circle comet conjunction constellation degrees diameter direction discovery disk distance diurnal motion doctrine double stars earth ecliptic equal equator equinox exhibit fact fixed stars force Galileo globe gravity greater greatest half Halley's comet heavenly bodies heavens Hence Herschel horizon hundred inferior conjunction inferior planets instrument Jupiter Kepler latitude laws length less light longitude lunar magnitude measure Mercury meridian meteors millions of miles minutes moon moon's motion move nearer nearly nebulæ node objects observations opposite orbit parallax passing perihelion period planetary planets pole respect revolve right ascension ring round satellites Saturn seen shadow side sidereal day solar system space spectator sphere sun's superior planets supposed surface tance telescope thousand tides tion Tycho Tycho Brahe universal gravitation Uranus velocity Venus visible west to east
Popularne fragmenty
Strona 195 - Less than archangel ruined, and the excess Of glory obscured ; as when the sun, new risen, Looks through the horizontal misty air Shorn of his beams, or from behind the moon, In dim eclipse, disastrous twilight sheds On half the nations, and with fear of change Perplexes monarchs.
Strona 36 - He scarce had ceased, when the superior fiend Was moving toward the shore : his ponderous shield, Ethereal temper, massy, large, and round, Behind him cast ; the broad circumference Hung on his shoulders like the moon, whose orb Through optic glass the Tuscan artist views, At evening, from the top of Fesole, Or in Valdarno, to descry new lands, Rivers, or mountains, in her spotty globe.
Strona 69 - Then stay'd the fervid wheels, and in his hand He took the golden compasses, prepared In God's eternal store, to circumscribe This universe, and all created things: One foot he centred, and the other turn'd Round through the vast profundity obscure, And said, ' Thus far extend, thus far thy bounds, This be thy just circumference, O world!
Strona 381 - O how canst thou renounce the boundless store Of charms which Nature to her votary yields ! The warbling woodland, the resounding shore, The pomp of groves, and garniture of fields ; All that the genial ray of morning gilds, And all that echoes to the song of even, All that the mountain's sheltering bosom shields, And all the dread magnificence of Heaven, O how canst thou renounce, and hope to be forgiven ! These charms shall work thy soul's eternal health, And love, and gentleness, and joy impart.
Strona 235 - Fairest of stars, last in the train of night, If better thou belong not to the dawn, Sure pledge of day, that crown'st the smiling morn With thy bright circlet, praise Him in thy sphere, While day arises, that sweet hour of prime.
Strona 181 - As when the moon, refulgent lamp of night, O'er Heaven's clear azure spreads her sacred light, When not a breath disturbs the deep serene, And not a cloud o'ercasts the solemn scene ; Around her throne the vivid planets roll, And stars unnumber'd gild the glowing pole, O'er the dark trees a yellower verdure shed, And tip with silver every mountain's head...
Strona 381 - IX. 0 how canst thou renounce the boundless store Of charms which Nature to her votary yields! The warbling woodland, the resounding shore, The pomp of groves, and garniture of fields; All that the genial ray of morning gilds, And all that echoes to the song of even, All that the mountain's sheltering bosom shields, And all the dread magnificence of heaven, O how canst thou renounce, and hope to be forgiven ! X.
Strona 365 - And fated to survive the transient Sun ! By mortals and immortals seen with awe ! A starry crown thy raven brow adorns, An azure zone thy waist ; clouds, in heaven's loom Wrought through varieties of shape and shade, In ample folds of drapery divine, Thy flowing mantle form, and, heaven throughout, Voluminously pour thy pompous train...
Strona 291 - God of the rolling orbs above ! Thy name is written clearly bright In the warm day's unvarying blaze, Or evening's golden shower of light. For every fire that fronts the sun, And every spark that walks alone Around the utmost verge of heaven, Were kindled at thy burning throne.
Strona 310 - If you forgive me, I rejoice; if you are angry, I can bear it: the die is cast, the book is written ; to be read either now or by posterity, I care not which : it may well wait a century for a reader, as God has waited six thousand years for an observer.