On the Figure of the Moon

Abstract

A rebiscussion of the librations of the Moon's axis is carried out literally to orders e2 and i2 of the main terms, and a solar effect not evaluated by Hayn is taken into account. It appears that solar effects nearly cancel the corrections for e2 and i2 . The observational data are rediscussed and it appears that $$\beta = 0.000 \enspace627 \enspace9 \pm 0.000 \enspace001 \enspace5$$