Què opinen els usuaris - Escriviu una ressenya
No hem trobat cap ressenya als llocs habituals.
Altres edicions - Mostra-ho tot
aberration angular approximately ascending node assume astronomical axes axis azimuth celestial sphere clock Coll constant coordinates correction corresponding cos2 cosec culmination determined Differentiating direction diurnal diurnal motion earth earth's orbit eccentricity ecliptic ephemeris equation equatorial equinox error Exam expression follows formula geocentric given graduated great circle Greenwich mean heliocentric Hence horizon horizontal parallax hour angle instrument intersection interval known latitude logarithms Math mean distance mean longitude mean noon mean solar measured meridian circle moon moon's motion nole nutation obliquity observer obtain parallel perpendicular planet point of Aries pole position angle precession proper motion quantities radius refraction respectively right ascension rotation seconds of arc semi-diameter Show sidereal day sin2 solstice spherical star Substituting sun's supposed tan2 tangent telescope transit triangle Trip true true anomaly velocity Venus whence zenith distance zero
Pàgina 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.
Pàgina 301 - The squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.
Pàgina 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.
Pàgina 496 - ... the ratio of the velocity of the Earth in its orbit to the velocity of light, might not need correction or modification.
Pàgina 244 - The space comprehended between the Tropic of Cancer and the Arctic Circle is the North Temperate Zone; and the similar space between the Tropic of Capricorn and the Antarctic Circle is the South Temperate Zone.
Pàgina 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.
Pàgina 145 - Kepler, and is expressed by his second law, which is thus stated:— In the motion of a planet round the sun, the radius vector, drawn from the centre of the sun to the planet, sweeps over equal areas in equal times.
Pàgina 238 - We shall suppose that t is the part of the equation of time due to the obliquity of the ecliptic, and t