Assertion: perturbation's effect | /r/HasProperty | overlooked
Facets:
value: at that time
type: TEMPORAL
Source sentences:
text: This figure is much smaller than the modern value: but it is close to the difference between the modern coefficients of the equation of the center (1st term) and that of the evection: the difference is accounted for by the fact that the ancient measurements were taken at times of eclipses, and the effect of the evection (which subtracts under those conditions from the equation of the center) was at that time unknown and overlooked.