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CONTENTS.
Page
Why the moon does not leave the earth . 73
General consideration of the forces disturbing the moon ... 76
Forces which pull the moon outwards (radial forces) ... 82
How these forces vary during the year ... ... ... 84
Resulting peculiarity of lunar motion called the annual
equation ... ... . 87
A variation of this variation due to changing figure of earth’s
orbit (secular acceleration) ... . ... ... ib.
Forces which hasten or retard the moon {tangential forces) 91Resulting peculiarity of lunar motion called the variation ... 94
Variation of this variation due to moon’s varying distancefrom sun during the month (parallactic inequality) ... ib.
Effect of tangential forces on the secular acceleration ... 97
How the radial forces affect the shape of the moon’s path ... 99
How they cause the place of the perigee to advance on the
whole ... ... ... ... ... . 100
How the tangential forces affect the place of the perigee ... 109
Why these forces hasten the advance of the perigee ... 113
Actual motion of the perigee considered . 124
How the eccentricity is affected by the disturbing forces .... 127
The erection .128
Effect of the disturbing forces on the position of the plane of
the moon's orbit ... ... ... . 129
General considerations ... ... . 130
Discussion of typical cases ... ... ... ib.
Regression of the line of nodes ... ... 133
Change of the inclination ... ... ... 136
Conclusion . ib.