Elements of Astronomy: Accompanied with Numerous Illustrations, a Colored Representations of the Solar, Stellar, and Nebular Spectra, and Celestial Charts of the Northern and Southern HemisphereAmerican book Company, 1870 - 312 σελίδες |
Συχνά εμφανιζόμενοι όροι και φράσεις
angle aphelion apparent motion apparent movements appear astronomers atmosphere attraction axis Boötes bright called celestial equator celestial pole celestial sphere centre changes circle clock color comet constellations density Describe determined diameter direction disk distance Earth Earth's orbit Earth's rotation Earth's surface equal equatorial eye-piece fact Geography globe gravity heat heavenly body heavens hemisphere Hence horizon inclined inferior planet Jupiter latitude length lens light longitude lunar magnitude Mars mass Mercury meridian meteors miles Moon Moon's move naked eye nearest nearly nebulæ Neptune night node northern object-glass observed parallax path perihelion period photosphere polar position prism rays Reader refraction represented revolution revolve round right ascension ring round the Sun satellites Saturn seen shadow sidereal solar day solstice southern spectrum spots stars Sun's superior planet suppose tance telescope tion Uranus Ursa vapor variable stars velocity Venus vernal equinox visible zenith zenith-distance
Δημοφιλή αποσπάσματα
Σελίδα 20 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Σελίδα 20 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.
Σελίδα 31 - Aries (the Ram), Taurus (the Bull) Gemini (the Twins), Cancer (the Crab), Leo (the Lion), Virgo (the Virgin), Libra (the Scales), Scorpio (the Scorpion), Sagittarius (the Archer), Capricornus (the Goat), Aquarius (the Water-bearer), and Pisces (the Fishes).
Σελίδα 153 - A man placed on one of them would spring with ease 60 feet high, and sustain no greater shock in his descent than he does on the earth from leaping a yard.
Σελίδα 31 - A'ries, the Ram. Taurus, the Bull Gem'ini, the Twins. Cancer, the Crab. Leo, the Lion.
Σελίδα 132 - Almost directly preceding, or at 270°, appeared a bluntly triangular pink body, suspended, as it were, in the corona. This was separated from the moon's edge when first seen, and the separation increased as the moon advanced. It had the appearance of a large conical protuberance, whose base was hidden by some intervening soft and ill-defined substance, like the upper part of a conical mountain, the lower portion of which was obscured by clouds or thick mist. I think the apex of this object must...
Σελίδα 87 - The LATITUDE of a place is its distance from the equator. If a place is north of the equator, it is said to be in NORTH LATITUDE, and if south, in SOUTH LATITUDE. It is evident, that the entire northern hemisphere is in north latitude, and the entire southern hemisphere in south latitude.
Σελίδα 130 - Moon's shadow sweeps across the surface of the Earth, and is even seen in the air ; the rapidity of its motion and its intenseness produce a feeling that something material is rushing over the Earth at a speed perfectly frightful.