Spherical AstronomyAsher, 1865 - 559 pŕgines |
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Altres edicions - Mostra-ho tot
Frases i termes més freqüents
according altitude apparent arithmetical mean ascension and declination axes azimuth Bessel celestial sphere centre co-ordinates compute constant correction cos & cos cos & sin cosine cotang deduced denote determined Diff difference of longitude differential coefficients diurnal motion dt dt earth equal expressed fixed ecliptic following equations formulae function given hence horizon hour angle instrument interpolation intersection interval logarithms meridian moon multiply numerical values nutation obliquity observations obtain orbit order to find parallax plane pole positive axis precession probable error probable values proper motion radius refraction right ascension screw semi-major axis sidereal sine spherical star substitute tables tang telescope triangle true ecliptic unknown quantities vernal equinox vertical circle wire zenith distance zero απ Υπ
Passatges populars
Pŕgina 339 - The cubes of the mean distances of the planets from the sun are proportional to the squares of their times of revolution.
Pŕgina 105 - At the equator, as we have seen,* the days and nights are equal throughout the year — that is, they consist of 12 hours each ; but if we recede from the equator, north or south, this equality will cease to exist. When the sun is north of the equator the days are longer than the nights in the northern hemisphere ; and when the sun is south of the equator the reverse of this is the case; and in the southern hemisphere, of course, similar changes take place. At the equator the day is always 12 hours...
Pŕgina 258 - Tables requisite to be used with the Nautical Ephemeris for finding the latitude and longitude at sea.
Pŕgina 125 - Atmospheric currents, in high latitudes, when undisturbed, are westerly, particularly in the winter season. If storms and gales revolve by a fixed law, and we are able, by studying these disturbing causes of the usual atmospheric currents, to distinguish revolving gales, it is likely that voyages may...
Pŕgina 131 - The Mean Obliquity of the Ecliptic at the beginning of the Year is taken 23°. 27'.
Pŕgina 331 - But if the two places are on the «same side of the equator, the angles at the centre of the earth in the triangles used before are different, namely </'=p<)' in one triangle and <p\ =p S in the other.
Pŕgina 172 - ... the values of a and b by the method of least squares. The rate during the time t...
Pŕgina 9 - A sin a cos B = cos 6 sin c — sin 6 cos c cos A, we may put: sin b cos A = m sin if cos b = m cos M.
Pŕgina 311 - THE rectangle contained by half of the radius, and the excess of the versed sines of two arches, is equal to the rectangle contained by the sines of half the sum, and half the difference of the same arches. Let AB, AC be any two arches, and let AD be made equal to AC the less ; the arch DB therefore is the...
Pŕgina 160 - ... third law (that the squares of the periodic times of two planets are as the cubes of their mean distances...