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First Observations in Astronomy: A Handbook for Schools and Colleges
Mary Emma Byrd
No preview available - 2018
accurate adjusted altitude and azimuth American Ephemeris angle angular aperture apparent approximately ascension and declination astronomical axis bright planets Byrd Cancri celestial equator celestial globe celestial sphere clock comet constellations coordinates correct corresponding Decl degrees diameter east ecliptic employed equinox estimates Exercise eye-piece field of view fixed given gives gnomon Greenwich heavenly body heavens hour-circle interval Jayne's Almanac latitude Lawrence local mean located longitude magnifying power marked mean solar measures meridian altitude meridian line minutes moon moon's object observations obtained opera-glasses passing plotting plumb lines position protractor rectangular paper reference line right ascension sidereal sidereal day sidereal period small telescope standard meridian star-maps stars subtracted sun noon sun-dial sunset point taken tions transit instrument Venus vernal equinox vertical circle watch error Wide View
Page 13 - Distance (Fig. 5) . — The Declination of a heavenly body is its angular distance north or south of the celestial equator, and is measured by the arc of the hour-circle passing through the object, intercepted between it and the equator.
Page 12 - The altitude of a point is its angular distance above the horizon measured on a vertical circle through the point. The complement of the altitude is called the ZENITH DISTANCE. The...
Page 14 - The ecliptic system is a system of celestial coordinates in which the ecliptic is the primary and great circles perpendicular thereto are the secondaries. The celestial latitude of a body is its angular distance north or south of the ecliptic, measured on the secondary passing through the body. The celestial longitude of a body is the angle between the secondary passing through the body and the secondary passing through the Vernal Equinox, measured on the ecliptic to the eastward to 360°. The student...
Page 32 - In order to explain the apparent motions of the five planets known to the ancients (Mercury, Venus, Mars, Jupiter, and Saturn...
Page 106 - Difference between opera-glass (§ 77) and telescopic views. (2) Density and form of cluster, and size in terms of the field of view. (3) Approximate number of stars by count or estimate. (4) Tendency to cluster in any noticeable way. (5) Range in magnitude of stars and contrasts in color. 7.
Page 12 - The Prime Vertical is that vertical circle which is at right angles to the meridian of a place.
Page 80 - The field of view differs with different eye-pieces. Its diameter, expressed in time, is the interval required for a star on the equator to pass centrally across the field. In making the actual determination, however...
Page 62 - ... how the instrument inverts, that is, whether the image is turned partially, as in a mirror, or whether it is completely inverted, both up for down and right for left. In focusing either telescope or opera-glasses, pains must be taken to obtain sharp, clear-cut images.