Regarding question four , "At what precise moment will the moon present herself in the most favorable position, etc.?"
Answer. -- After what has been said above, it will be necessary, first of all, to choose the period when the moon will be in perigee, and also the moment when she will be crossing the zenith, which latter event will further diminish the entire distance by a length equal to the radius of the earth, i. e. 3,919 miles; the result of which will be that the final passage remaining to be accomplished will be 214,976 miles. But although the moon passes her perigee every month, she does not reach the zenith always at exactly the same moment . She does not appear under these two conditions simultaneously, except at long intervals of time. It will be necessary, therefore, to wait f
