VI CONTENTS. 



9 SECTION V. 



Lunar Theory Periodic Perturbations of the Moon Equation of Center 

 Evection Variation Annual Equation Direct and Indirect Action of 

 Planets The Moon's Action on the Earth disturbs her own Motion- 

 Eccentricity and Inclination of Lunar Orbit Invariable Acceleration 

 Secular Variation in Nodes and Perigee Motion of Nodes and Perigee 

 inseparably connected with the Acceleration Nutation of Lunar Orbit 

 Form and Internal Structure of the Earth determined from it Lunar, 

 Solar, and Planetary Eclipses Occultations and Lunar Distances Mean 

 Distance of the Sun from the Earth obtained from Lunar Theory Abso- 

 lute Distances of the Planets, how found .... Page 33 



SECTION VI. 



Form of the Earth and Planets Figure of a Homogeneous Spheroid in 

 Rotation Figure of a Spheroid of Variable Density Figure of the 

 Earth, supposing it to be an Ellipsoid of Revolution Mensuration of a 

 Degree of the Meridian Compression and Size of the Earth from 

 Degrees of Meridian Figure of Earth from the Pendulum . 43 



SECTION VII. 



Parallax Lunar Parallax found from direct Observation Solar Parallax 

 deduced from the Transit of Venus Distance of the Sun from the 

 Earth Annual Parallax Distance of the Fixed Stars . . 51 



SECTION VIII. 



Masses of Planets that have no Satellites determined from their Perturba- 

 tions Masses of the others obtained from the Motions of their Satellites 

 Masses of the Sun, the Earth, of Jupiter, and of the Jovial System 

 Mass of the Moon Real Diameters of Planets, how obtained Size of 

 Sun Densities of the Heavenly Bodies Formation of Astronomical 

 Tables Requisite Data and Means of obtaining them . . . 54 



SECTION IX. 



Rotation of the Sun and Planets Saturn's Rings Periods of the Rotation 

 of the Moon and other Satellites equal to the Periods of their Revolu- 

 tions Form of Lunar Spheroid Libration, Aspect, and Constitution of 

 the Moon Rotation of Jupiter's Satellites GO 



SECTION X. 



Rotation of the Earth invariable Decrease in the Earth's Mean Tempera- 

 ture Earth originally in a State of Fusion Length of Day constant 

 Decrease of Temperature ascribed by Sir John Herschel to the Variation 

 in the Eccentricity of the Terrestrial Orbit Difference in the Tempera- 

 ture of the Two Hemispheres, erroneously ascribed to the Excess in the 

 Length of Spring and Summer in the Southern Hemisphere ; attributed 

 by Mr. Lyell to the Operation of existing Causes Three Principal Axes 

 of Rotation Position of the Axis of Rotation on the Surface of the Earth 

 invariable Ocean not sufficient to restore the Equilibrium of the Earth 

 if deranged Its Density and Mean Depth Internal Structure of the 

 Earth m 



