Definitions in Astronomy and Navigation Made Easy

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William Blackwood & Sons, 1865 - 29 σελίδες
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Σελίδα 14 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.
Σελίδα 17 - The longitude of a heavenly body is the arc of the ecliptic intercepted between the first point of Aries and the circle of latitude passing...
Σελίδα 16 - ... equator intercepted between the first point of Aries and the circle of declination passing through the place of the body in the celestial concave.
Σελίδα 19 - Mean Solar Day is the interval between two successive transits of the mean sun over the same meridian ; it begins when the mean sun is on the meridian.
Σελίδα 19 - The sidereal day is the interval between two successive transits of the first point of Aries over the same meridian.
Σελίδα 17 - Azimuth is the angular distance of a celestial object from the north or south point of the horizon (according as it is the north or south pole which is elevated), when the object is referred to the horizon by a vertical circle ; or it is the angle comprised between two vertical planes — one passing through the elevated pole, the other through the object.
Σελίδα 19 - The interval between two successive transits of the actual sun's centre over the same meridian ; it begins when that point is on the meridian. The apparent solar day is variable in length from two causes : first, the sun does not move uniformly in the ecliptic — its apparent path sometimes describing an arc of 57', and at other times an arc of 61...
Σελίδα 17 - Owing to the obliquity of the ecliptic — the angle at which the ecliptic is inclined to the celestial equator...
Σελίδα 19 - Month. 27-32166 days, the interval between two successive passages of the Moon through the same point in her orbit relative to the fixed stars. Sidereal Noon. The instant when the First Point of Aries is on the meridian at upper CULMINATION (qv), indicated by 0 hours local sidereal time. Sidereal Period. The interval between two successive positions of a celestial body at the same point with reference to the fixed stars; the same applied to an artificial satellite as seen from the Earth, although...

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