Spherical Astronomy

Portada
D. Van Nostrand, 1865 - 559 pàgines
 

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Continguts

Determination of the difference of longitude by occultations
336
86
342
Determination of the difference of longitude by lunar distances
344
Determination of the difference of longitude by culminations
350
Effect of the errors of the instrument upon the observations
429
Geometrical method for deducing the approximate formulae
433
Determination of the errors of the instrument
434
Observations of altitudes
437
Formulae for the other instruments deduced from those for the al titude and azimuth instrument
441
Determination of the errors of the instrument
445
Use of the equatoreal for determining the relative places of stars
449
THE TRANSIT INSTRUMENT AND THE MERIDIAN CIRCLE 18 Effect of the errors of the instrument upon the observations
451
Geometrical method for deducing the approximate formulae
456
Reduction of an observation on a lateral wire to the middle wire Determination of the wiredistances 4
460
Reduction of the observations if the observed body has a parallax and a visible disc
461
Determination of the errors of the instrument
466
Reduction of the zenith distances observed at some distance from the meridian Effect of the inclination of the wires The same for the case when the b...
477
W THE PRIME VERTICAL INSTRUMENT 25 Effect of the errors of the instrument upon the observations
484
Determination of the latitude by means of this instrument when the errors are large The same for an instrument which is nearly adjusted
488
Reduction of the observations made on a lateral wire to the middle wire e
492
Determination of the errors of the instrument
498
ALTITUDE INSTRUMENTS 29 Entire circles
499
The sextant On measuring the angle between two objects Ob servations of altitudes by means of an artificial horizon
500
Effect of the errors of the sextant upon the observations and de termination of these errors
503
INSTRUMENTS WHICH SERVE FOR MEASURING THE RELATIVE PLACE OF TWO HEAVENLY BODIES NEAR EACH OTHER MICROME...
512
Other kinds of filar micrometers
517

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Passatges populars

Pàgina 339 - The cubes of the mean distances of the planets from the sun are proportional to the squares of their times of revolution.
Pàgina 105 - At the equator, as we have seen,* the days and nights are equal throughout the year — that is, they consist of 12 hours each ; but if we recede from the equator, north or south, this equality will cease to exist. When the sun is north of the equator the days are longer than the nights in the northern hemisphere ; and when the sun is south of the equator the reverse of this is the case; and in the southern hemisphere, of course, similar changes take place. At the equator the day is always 12 hours...
Pàgina 258 - Tables requisite to be used with the Nautical Ephemeris for finding the latitude and longitude at sea.
Pàgina 125 - Atmospheric currents, in high latitudes, when undisturbed, are westerly, particularly in the winter season. If storms and gales revolve by a fixed law, and we are able, by studying these disturbing causes of the usual atmospheric currents, to distinguish revolving gales, it is likely that voyages may...
Pàgina 131 - The Mean Obliquity of the Ecliptic at the beginning of the Year is taken 23°. 27'.
Pàgina 331 - But if the two places are on the «same side of the equator, the angles at the centre of the earth in the triangles used before are different, namely </'=p<)' in one triangle and <p\ =p S in the other.
Pàgina 172 - ... the values of a and b by the method of least squares. The rate during the time t...
Pàgina 9 - A sin a cos B = cos 6 sin c — sin 6 cos c cos A, we may put: sin b cos A = m sin if cos b = m cos M.
Pàgina 311 - THE rectangle contained by half of the radius, and the excess of the versed sines of two arches, is equal to the rectangle contained by the sines of half the sum, and half the difference of the same arches. Let AB, AC be any two arches, and let AD be made equal to AC the less ; the arch DB therefore is the...
Pàgina 160 - ... third law (that the squares of the periodic times of two planets are as the cubes of their mean distances...

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