First Observations in Astronomy: A Handbook for Schools and Colleges

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Rumford Press, 1914 - Astronomy - 126 pages
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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 75 - A sidereal day is the interval between two successive transits of the vernal equinox across the same meridian. Sidereal...
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.
Page 14 - Owing to the obliquity of the ecliptic — the angle at which the ecliptic is inclined to the celestial equator...

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