Lunar and horary tables, for ... ascertaining the longitude |
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Seite 8
... minutes , & c . , from which subtract the retardation ( Table R. ) , the result will be the mean time required . EXAMPLE I. In latitude 33 ° 51 ′ N. the true altitude of Regulus , observed west of the meridian , was 39 ° 21 ' ; the ...
... minutes , & c . , from which subtract the retardation ( Table R. ) , the result will be the mean time required . EXAMPLE I. In latitude 33 ° 51 ′ N. the true altitude of Regulus , observed west of the meridian , was 39 ° 21 ' ; the ...
Seite 17
... minute of error in the longitude . 5. The following is the usual method of writing down a set of lunar distances , with the altitudes of the objects observed at the same time , and of finding the mean observed distance and altitudes ...
... minute of error in the longitude . 5. The following is the usual method of writing down a set of lunar distances , with the altitudes of the objects observed at the same time , and of finding the mean observed distance and altitudes ...
Seite 26
... minute of time , will , in places near the equator , be nearly 15 minutes IV . When the object is considerably distant , both of a degree ; in high latitudes the error is less . 26.
... minute of time , will , in places near the equator , be nearly 15 minutes IV . When the object is considerably distant , both of a degree ; in high latitudes the error is less . 26.
Seite 32
... minute is sufficient . Twelve hours are rejected from the apparent astronomical time by observation to compare it with the time shewn by Chronometer . § In South Lat . read the Sun's Azimuth by compass from the north point as above ...
... minute is sufficient . Twelve hours are rejected from the apparent astronomical time by observation to compare it with the time shewn by Chronometer . § In South Lat . read the Sun's Azimuth by compass from the north point as above ...
Seite 34
... . , therefore the S. T. M. N. 9.48406 9-68268 h . m . s . 5 51 34 D's true azimuth ,, mag . azimuth S. 87 ° 53 ' 30 " W . 106 Variation , west 18 ° The nearest minutes of the true altitude , polar distance is taken out for 5 days . 34.
... . , therefore the S. T. M. N. 9.48406 9-68268 h . m . s . 5 51 34 D's true azimuth ,, mag . azimuth S. 87 ° 53 ' 30 " W . 106 Variation , west 18 ° The nearest minutes of the true altitude , polar distance is taken out for 5 days . 34.
Häufige Begriffe und Wortgruppen
Add for Seconds ALDEBARAN apparent distance Arcturus astronomical Betelguese Chro Constellation Corr D's App daily rate decg decl deduced degrees Deneb Diff ecliptic error and rate error for mean EXAMPLE find the Error find the mean finding the longitude Fixed Star Greenwich date Greenwich mean horary angle incg index error interval LOGARITHMS LOGARITHMS of NUMBERS lunar distances M. T. Gwh mean noon merid Moon's app Moon's apparent altitude Moon's hor Moon's horizontal parallax Moon's red natural number natural versed sine Nautical Almanac nearly object observed altitude observed distance observed East opposite place of observation Planet polar distance Pole Star prime vertical PROPORTIONAL LOGARITHMS refraction right ascension SECOND CORRECTIONS SECOND DIFFERENCE semid Sextant slow for mean Star's subtracted SUM and DIFFERENCE SUM OR DIFFERENCE Sun's Apparent Altitude Sun's declination Sun's true Table taken Telescope Ther THIRD CORRECTION true altitude true distance tude Ursa Major watch West
Beliebte Passagen
Seite 70 - C, as seen above, are constants, depending upon the latitude of the place of observation and the declination of the star. Tables for these quantities will be found in an appendix to Annual Report US Coast and Geodetic Survey for 1874.
Seite 54 - Gamma ; and so on. When the number of stars in a constellation, exceeds the letters in the Greek alphabet, the letters of the Roman alphabet, a, b, c, d, &c. are applied to the remaining stars in the same manner ; and when these are not sufficient, the numbers, 1, 2, 3, 4, 5, &c.
Seite 56 - Aries, the Ram ; 2. Taurus, the Bull ; 3. Gemini, the Twins ; 4. Cancer, the Crab ; 5. Leo, the Lion ; 6. Virgo, the Virgin ; 7. Libra, the Balance ; 8. Scorpio, the Scorpion; 9. Sagittarius, the Archer ; 10. Capricornus, the Goat; 11. Aquarius, the Water-bearer ; 12. Pisces, the Fishes.
Seite 9 - ... will be the right ascension of the meridian. From the right ascension of the meridian (increased by 24 hours if necessary) subtract the sun's right ascension...
Seite 63 - Subtract the true altitude of the sun's centre from 90°, and the remainder will be the sun's true meridian zenith distance, which is to be called north or south according as the observer is north or south of the sun at the time of observation.
Seite 25 - Rule. — Find the latitudes of both places; if both be north, or both south, their difference will be the answer; but if one be north and the other south, their sum will be the answer. Exercise.— What is the difference of lat. between Philadelphia and Petersburg? Ans., 20 degrees. Between Madras and Waterford? Am., 39° 13'.