| 单词 | hour angle |
| 例句 | Let also the hour angle corresponding to p be 90� − n, and the declination of the same = m, the star’s declination being δ, and the latitude ϕ. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z What is the hour angle of the sun when it has the greatest altitude? A Text-Book of Astronomy 2011-01-05T03:00:57.347Z It is the relation of the sun's hour angle to apparent time. Lectures in Navigation Seated at the same table as herself was a skilful sailor, using logarithms, secants and cosecants, polar distances and hour angles, as if he were in some university class-room. The Captain of the Kansas The diagram represents, 1st, circles of equal altitudes; 2ndly, the path of sun, stars, etc., for each 10th degree of declination; 3rdly, the hour angles, all projected down upon--4thly--the level compass card. The Art of Travel Shifts and Contrivances Available in Wild Countries He would read on the chronometer the hour of the meridian of Greenwich, and from it would be able to deduce the longitude by the hour angle. Dick Sand A Captain at Fifteen What is the hour angle of the sun at noon? A Text-Book of Astronomy 2011-01-05T03:00:57.347Z Then your ship's hour angle would be the angle at the pole intersecting the meridian of your ship and the meridian of the sun or LPS and measured by the arc LS. Lectures in Navigation For the longitude, the altitude of the sun must be ascertained before and after noon, and two hour angles must be measured. The Fur Country Seventy Degrees North Latitude There the captain fixed his position and used a chronometer to calculate his longitude, which he double–checked against his previous observations of hour angles. Twenty Thousand Leagues Under the Sea By hour angle, I mean the distance in time from your meridian to the meridian of the point or celestial body in question. Lectures in Navigation The hour angle of the center of the sun is the measure of apparent or solar time. Lectures in Navigation Astronomical time, either apparent or mean, is the hour angle of the true or mean sun respectively, measured to the westward throughout its entire daily circuit. Lectures in Navigation I had climbed onto the platform just as the chief officer was taking his readings of hour angles. Twenty Thousand Leagues Under the Sea |
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