An Introduction to Astronomy: Designed as a Textbook for the Use of Students of Yale CollegeCollins, Keese, & Company, 1839 - 276 páginas In an exploration of black American military heroes from Crispus Attucks to Colin Powell, Buckley presents a history of bravery, valor, patriotism, and extraordinary personal courage both on and off the battlefield. American Patriots is one of the great untold stories in American history. There have been books on individual black soldiers, but this is the first to tell the full story of the black American military experience, starting with the Revolution & culminating with Desert Storm. The best histories are about more than facts & events-they capture the spirit that drives men to better their lives & to demand of themselves the highest form of sacrifice. That spirit permeates Gail Buckley's dramatic, deeply moving, & inspiring book. You'll meet the men who fought in the decisive engagements of the Revolution, the legendary Buffalo Soldiers, & the heroic black regiments of the Civil War. You'll meet some of America's greatest patriots-men who fought in the First & Second World Wars when their country denied them access to equipment & training, segregated the ranks, & did all it could to keep them off the battlefield. You'll meet the heroes of Korea, Vietnam, & Desert Storm. And you'll meet two families, the Lews & the Pierces, who have served in every major American engagement since the Revolution. FDR used to say that Americanism was a matter of the mind & heart, not of race & ancestry. With photographs throughout & dozens of original interviews with veterans, American Patriots is a tribute to the black American men & women who fought & often gave their lives in the service of that ideal. |
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altitude aphelion apparent diameter appear apsides ascertained astronomers axis azimuth celestial celestial sphere circle comet conjunction constellation declination degree described direction disk diurnal diurnal motion double stars earth earth's orbit earth's shadow eccentricity ecliptic equal equator equinoctial equinox figure fixed stars force globe gravity greater greatest heavenly bodies heavens Hence Herschel horizon horizontal parallax hour inclination inferior conjunction inferior planet Jupiter known latitude learner light longitude lunar magnitude measured Mercury meridian miles moon moon's orbit motion move nearly node oblique observations opposite parallax parallel passes perigee perihelion period perpendicular planetary pole quantity of matter refraction respect revolution revolve right angles right ascension ring satellites Saturn seen semi-diameter side sidereal sidereal day spectator sphere sun and moon sun's superior conjunction superior planets supposed surface telescope tides tion Uranus velocity Venus vernal equinox visible west to east zenith
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Página 89 - GRAVITATION, is that influence by which every body in the universe, whether great or small, tends towards every other, with a force which is directly as the quantity of matter, and inversely as the square of the distance.
Página 255 - Another, in the constellation Andromeda, presents a visible disk of 12", perfectly defined and round. Granting these objects to be equally distant from us with the stars, their real dimensions must be such as would fill, on the lowest computation, the whole orbit of Uranus. It is no less evident that, if they be solid bodies of a solar nature, the intrinsic splendor of their surfaces must be almost infinitely inferior to that of the sun's.
Página 199 - ... satellites. But we shall do wrong to judge of the fitness or unfitness of their condition from what we see around us, when, perhaps, the very combinations which convey to our minds only images of horror may be in reality theatres of the most striking and glorious displays of beneficent contrivance.
Página 257 - It was then as bright as Sirius, and continued to increase till it surpassed Jupiter when brightest, and was visible at mid-day. It began to diminish in December of the same year, and in March 1574, had entirely disappeared.
Página 259 - IN 1803, Sir William Herschel first determined and announced to the world, that there exist among the stars separate systems, composed of two stars revolving about each other in regular orbits. These he denominated binary stars, to distinguish them from other double stars where no such motion is detected, and whose proximity to each other may possibly arise from casual juxtaposition, or from one being in the range of the other.
Página 201 - These satellites offer remarkable, and indeed quite unexpected and unexampled peculiarities. Contrary to the unbroken analogy of the whole planetary system, the planes of their orbits are nearly perpendicular to the ecliptic, being inclined no less than 78° 58' to that plane, and in these orbits their motions are retrograde; that is, instead of advancing from west to east around their primary, as is the case with all the other planets and satellites, they move in the opposite direction. With this...
Página 227 - ... of their attraction beyond calculable limits. Under such circumstances, we might have " years of unequal length, and seasons of capricious temperature, planets and moons of portentous size and aspect, glaring and disappearing at uncertain intervals...
Página 195 - Fig. 46. broader and less strongly marked than those of Jupiter, and owing doubtless to a similar cause. That the ring is a solid opake substance, is shown by its throwing its shadow on the body of the planet on the side nearest the sun, and on the other side receiving that of the body.
Página 256 - This remarkable law of variation certainly appears strongly to suggest the revolution round it of some opaque body, which, when interposed between us and Algol, cuts off a large...
Página 233 - Their tails consist of matter of such tenuity that the smallest stars are visible through them. They can only be regarded as great masses of thin vapor, susceptible of being penetrated through their whole substance by the sunbeams, and reflecting them alike from their interior parts and from their surfaces.