A Handbook of Practical Astronomy for University Students and EngineersRegister Publishing Company, 1891 - 166 pages |
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Common terms and phrases
accurately adjustment Ann Arbor apparent place apparent zenith distance ascension and declination azimuth centre Chronom chronometer correction circle readings circumpolar star clamp east clamp west collimation computed corresponding declination circle determine Detroit Observatory difference direct the telescope diurnal aberration double altitudes earth ecliptic equator equatorial equatorial star Example eye piece given Greenwich mean horizon hour angle hour circle index correction instant latitude level constant level readings limb logarithm longitude lower culmination mean place measured micrometer readings micrometer wire middle wire moon's Naut Nautical Almanac nearly Nebula object glass observer's obtain parallax polar position precession prime vertical probable error proper motion reduced refraction reversing right ascension rotation axis screw semidiameter sextant reading sidereal chronometer sin² star observed star's sun's t₁ t₂ tables Therm tion transit instrument true zenith distance vernal equinox vernier vertical circle zenith telescope zero
Popular passages
Page 5 - The geographical longitude of a place is the arc of the equator intercepted between the meridian of the place and the meridian of some other place assumed as origin. It is customary to reckon longitudes west ( + ) and east ( — ) from the meridian of Greenwich, through 12 hours, or 180°.
Page 11 - A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B...
Page 11 - ... cos a = cos b cos c + sin b sin c cos A, sin a cos B = cos b sin c - sin b cos c cos A, sin a sin B = sin b sin A.
Page 70 - SW 756), the court refused to disturb a conviction of murder on an objection based upon the fact that during the early stages of impaneling the jury two men were stationed on the afternoon of one day and the forenoon of the next day at...
Page 7 - A solar day is the interval of time between two successive upper transits of the sun over the same meridian. The solar time at any instant is the hour angle of the sun at that instant.
Page 27 - His true position is in the diagonal of the parallelogram, whose sides are in the ratio of the velocity of light to the velocity of the earth in its orbit, which is as 190000 to 19.
Page 6 - A Solar Day is the interval of time between two successive transits of the sun over the same meridian; and the hour-angle of the sun is called Solar Time.
Page 21 - When a ray of light passes obliquely from one transparent medium into another of different density it is bent aside from its course.
Page 85 - In a surveying telescope, the Imaginary line passing through the optical centre of the object glass and the intersection of the cross-hairs in the diaphragm.
Page 63 - Having made the adjustments of the index and horizon mirrors and of the telescope, as previously described, it is necessary to find that point of the arc at which the zero of the vernier falls when the two mirrors are parallel, for all angles measured by the sextant are reckoned from that point. If this point is to the left of the...