Rudimentary Astronomy

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Crosby Lockwood & Company, 1882 - 175 páginas
 

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Contenido

Definition of curvature
25
Circle of curvature
26
Principles of construction of the zenith sector
27
Method of measuring the earthcurvature at any station
28
Expeditions for the measure of an arc of the meridian
29
Reference for full description of the Greenwich instruments
30
Shape of the earth
31
Ratio of the earths polar and equatorial diameters
32
CHAPTER II
34
Aberration of light the remaining cause of apparent displace
36
Chief object of astronomical observations
37
Method of determining right ascensions 15
39
Means of measuring the error of collimation
40
Numerical correction for error of collimation
41
Signs of the zodiac
66
129
67
Investigation of the amount of lunar parallax
84
Geometrical steps of the process
85
Knowledge of the earths form necessary in the investigation of lunar parallax 43
86
A different method necessary for investigation of the parallax 44
87
Methods for determining solar parallax 44
88
8991 Sketch of the method of determining solar purallax by the transit of Venus over the suns disk with the result obtained
89
On the solar faculæ 169 Results of the observations of the solar eclipse of 1851
91
Methods of determining solar parallax by observations of the planet Mars near apposition 47
92
CHAPTER V
93
Parallaxes of the fixed stars
94
Keplers first and second laws are obeyed in the orbit 177 Excentricity of the orbit 178 Progression of the perigee
95
Ellipse apparently described by a star round its mean place in consequence of annual parallax
96
Description of the HELIOMETER
97
Parallax and distance of 61 Cygni
98
General remarks on the action of the suns disturbing force
99
Parallaxes of a Centauri and a Lyræ
100
Disturbance of the plane of the ecliptic by the action of the planets
112
Bradleys discovery of the cause of the aberration of light illustrated
113
Effect of aberration on the place of a star
114
Effect of aberration on the apparent place of y Draconis
115
Value of the constant of aberration 117 Aberration of the planets 62
116
Greatest elongation of Venus
118
118_120 Diurnal aberration 121 122 Sum of corrections to be applied to the R A and N P D of a star for refraction parallax precession nuta
121
On the planet Mercury
124
Zodiacal starmaps of Bremiker and Bishop
127
Keplers third law enunciated
131
Ellipticity of Saturn
133
Discovery of a satellite of Neptune and suspicion of a ring
139
Periodic time in a circular orbit invest gated
140
Camets and meteors
145
CHAPTER VII
146
Method of determining the progression of the apogee
152
On partially resolvable nebulo
157
Dispersion of white light
163
Force of gravity at the surface of the
164
On starclusters
169
Evident motion of the sun in the heavens 2
2
139
5
Planetary phenomena
7
Statement of preliminary knowledge which is requisite
14
Description of the spiritlevel for measuring the error of level 18
18
Numerical correction for error of level 19
19
Precautions used to insure uniformity of heating and cooling
20
Method to be employed when two consecutive observations cannot be obtained 21
21
Method of obtaining by the transit instrument the error and rate of the clock 22
22
Northpolar distance the other coordinate necessary for de termining the place of a body 23
23
Method of eliminating the effect of excentricity of the circle 53 Importance of employing several pairs of opposite micro scopes 26
26

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