| 单词 | sidereal time |
| 例句 | Astronomers prefer sidereal time for planning their observations because in that system, a star rises at the same time every day. Astronomy 2016-10-13T00:00:00Z But one puzzling signal showed up most days at the same sidereal time. Readers Respond to the April 2018 Issue 2018-08-03T04:00:00Z When time is calculated by the stars it is called sidereal time; when by the sun, solar, or apparent time. Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained 2011-07-12T02:00:28.027Z "Billy, tell me what they mean by 'sidereal time.'" All Men are Ghosts 2011-06-28T02:00:12.497Z The driving screw having been thrown out of gear, the circle is turned until the outer vernier indicates the sidereal time, whereupon the driving screw is thrown into gear again. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z The sidereal time is equal to the angle between these lines, provided that that angle must be measured from the zenith toward the west. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z In the 17th century it was a favourite device to make a clock show sidereal time as well as mean solar time. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" Near the instrument is a clock regulated to sidereal time. Sir William Herschel: His Life and Works Near the instrument is a clock regulated to sidereal time.... Pioneers of Science So far as this lecture is concerned, we will omit any mention of sidereal time, i.e., time by the stars. Lectures in Navigation Exercise 9.—Set such a clock to sidereal time by means of the transit of a star over your meridian. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z A capital bit of horology, the pendulum of which is usually compensated to sidereal time, for astronomical purposes. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. Sykes pointed to the delicate instrument that could add, subtract, divide, and multiply, in fractions and whole numbers, as well as measure the light years in sidereal time. The Space Pioneers Clocks are set to the invariable sidereal time. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work Today we are going to talk about star time, or, using the more common words, sidereal time. Lectures in Navigation The middle of this period may be taken as the time at which the star crossed the meridian and at this moment the sidereal time is equal to the right ascension of the star. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z The apparent time by the sun, or the sidereal time of the moon, or planets, or stars, from the meridian. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. The hours of the swine, like those of their masters, were not reckoned by either solar or sidereal time, but had been altered, as experiment had demonstrated, to a more efficient cycle. City of Endless Night The equation of time and the sidereal time of mean noon complete the ephemeris proper. Side-Lights on Astronomy and Kindred Fields of Popular Science For the last two days we have been discussing Time - sun time or solar time and star time or sidereal time. Lectures in Navigation Having set the clock approximately to sidereal time, observe one or two more stars in the same way as above. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z VI.—The measurement of time 86 Solar and sidereal time—Longitude—The calendar—Chronology. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z The sidereal time at any moment is the right ascension of the hour circle which at that moment coincides with the meridian. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z The result will be the distance in sidereal time the star is from your meridian i.e., the time interval from local mean noon expressed in units of sidereal time. Lectures in Navigation Now let us examine time by the stars - sidereal time. Lectures in Navigation When the sidereal time is 13 hours, 14 hours, etc., the clock will indicate 1 hour, 2 hours, etc., and 12 hours must then be added to the time shown on the dial. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z Convert this sidereal time interval into a mean time interval by always subtracting the reduction for the proper number of hours, minutes and seconds as given in Table 8, Bowditch. Lectures in Navigation Convert this sidereal time interval into a mean time interval by always subtracting for the proper number of hours, minutes and seconds as per Table 8, Bowditch. Lectures in Navigation |
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