Page 271 - 89 history of astronomy_opt

part of the earth’s mass. Therefore the axis
of the equatorial belt of the earth must re-
volve round the pole of the ecliptic. Then
he set to work and found the amount due
to the moon and that due to the sun, and
so he solved the mystery of 2,000 years.
When Newton applied his law of grav-
itation to an explanation of the tides he
started a new field for the application of
271