Page 239 - 89 history of astronomy_opt

the lunar inequality called evection to vari-
ations in the value of the eccentricity and
in the direction of the line of apses, at the
same time correctly assigning the disturb-
ing force of the Sun as the cause. He dis-
covered the errors in Jupiter’s calculated
place, due to what we now know as the long
inequality of Jupiter and Saturn, and mea-
sured with considerable accuracy the accel-
239