An Elementary Treatise on Astronomy: In Two Parts. The First Containing, a Clear and Compendious View of the Theory; the Second, a Number of Practical Problems. To which are Added, Solar, Lunar, and Other Astronomical Tables ...Kimber & Sharpless, 1842 - 471 pages |
From inside the book
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Page 8
... quantities are given for each sign and degree of the circle , to find the quantity corresponding to signs , degrees , minutes , and seconds , PROB . III . To convert degrees , minutes and seconds of the equator into time , . 275 278 282 ...
... quantities are given for each sign and degree of the circle , to find the quantity corresponding to signs , degrees , minutes , and seconds , PROB . III . To convert degrees , minutes and seconds of the equator into time , . 275 278 282 ...
Page 9
... quantity at three consecutive whole hours , T - 1 , T , and T + 1 , being given , to find its value at an inter- mediate time T ' , and its hourly variation at that time , PAGE 323 324 PROB . XVIII . To find the longitude of a place ...
... quantity at three consecutive whole hours , T - 1 , T , and T + 1 , being given , to find its value at an inter- mediate time T ' , and its hourly variation at that time , PAGE 323 324 PROB . XVIII . To find the longitude of a place ...
Page 13
... quantity in comparison with the distance of the stars . In consequence of their immense distance , the fixed stars appear merely as luminous points , even when viewed with telescopes of high power ; whereas the planets , when thus ...
... quantity in comparison with the distance of the stars . In consequence of their immense distance , the fixed stars appear merely as luminous points , even when viewed with telescopes of high power ; whereas the planets , when thus ...
Page 41
... quantity , the value of which for different mediums is determined by experi- ment , we have sin I : sin R :: m : 1 ; or , sin I = m sin R. For the passage of a ray of light from a vacuum into air of a mean density , or that which it has ...
... quantity , the value of which for different mediums is determined by experi- ment , we have sin I : sin R :: m : 1 ; or , sin I = m sin R. For the passage of a ray of light from a vacuum into air of a mean density , or that which it has ...
Page 51
... quantities in It is not essential that the two observers should be on exactly the same meridian ; for if the meridian zenith dis- tances of the body be observed on several consecutive days , its change of meridian zenith distance in a ...
... quantities in It is not essential that the two observers should be on exactly the same meridian ; for if the meridian zenith dis- tances of the body be observed on several consecutive days , its change of meridian zenith distance in a ...
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Common terms and phrases
affirmative altitude apparent diameter approximate argument ascension and declination astronomical axis body called celestial sphere centre circle computed consequently corrected corresponding cosine Cotang Diff difference diurnal motion dominical letter earth eclipse equal equator equatorial parallax Evection expressed fixed star formulæ full moon given place Greenwich heliocentric Hence horizon horizontal parallax hour angle hourly motion hourly variation interval Jupiter logarithm longitude and latitude mean anomaly mean longitude Mercury meridian motion in longitude Nautical Almanac nearly negative node noon nutation obliquity observed obtained parallax parallel perigee period perpendicular planet pole position quantity radius vector refraction retrograde motion revolution right ascension satellites semidiameter sidereal sine solar subtract sun and moon sun's longitude sun's mean tang tangent tides tion triangle true anomaly true longitude tude values Venus vernal equinox
Popular passages
Page 15 - ... by an ether diffused through space; but if so, how happens it that the planets also have not been retarded ? This the' author attempted to show might be the case, although the phenomenon might pass unobserved.
Page 197 - ... before. This was the star in question. It was then as bright as Sirius, and continued to increase till it surpassed Jupiter when brightest, and was visible at mid-day. It began to diminish in December of the same year, and in March 1574, had entirely disappeared.
Page 80 - Year, and consists of 365 days, в hours, 9 minutes, and 9. 6 seconds, which is invariable. The Tropical Year is the interval between two consecutive returns of the Sun to the Vernal Equinox.
Page 18 - The azimuth of a body is the arc of the horizon intercepted between the north or south point of the horizon, and a vertical circle passing through the body.
Page 122 - The sidereal time of our common noon is given in the nautical almanac for every day in the year...
Page 14 - Mercury, Venus, the Earth, Mars, Vesta, Juno, Ceres, Pallas, Jupiter, Saturn, and Uranus, in the order here enumerated.
Page 196 - ... of these clusters are visible to the naked eye. In the cluster called the Pleiades, six stars are readily perceived by the naked eye, and we obtain glimpses of many more. With a telescope of moderate power 188 stars can be counted.
Page 306 - ... earth's atmosphere. With this radius describe the circle ADB about the centre C. Add the moon's semi-diameter to the radius CB, and with this sum for a radius, describe about the centre C a circle, which, if there be an eclipse, will cut NL in two points, E and H representing respectively the places of the moon's centre at the beginning and end of the eclipse. Draw the line CKR perpendicular to LN, and cutting it in K. The hours and minutes marked on the line LN, at the points E, K, and H, will...
Page 85 - The squares of the periods of the planets are proportional to the cubes of their mean distances from the sun ; that is, ti2 : k2 ,• ,• ai3 ,• (h3This is the so-called harmonic law.
Page 109 - That node where the planet passes from the south to the north side of the ecliptic, is called the ascending node ; and the other is the descending node.