JUPITER
May well be called this month the “Ruler of the Night.” From twilight till near the dawn his broad face looks condescendingly upon our little world, and by his example cheerily bids us “pursue the even tenor of our way.” Jupiter rises on the 1st at 2:26 p. m., sets next morning at 4:02 a. m.; on the 16th, rises at 1:24 p. m., sets on 17th at 3:02 a. m.; rises on 30th, at 12:29 p. m., and sets next morning at 2:07 a. m. Before the 21st, retrograde motion amounts to 36′ 26″; after that date to end of month, direct motion equals 8′ 42″; diameter diminishes three seconds, from 40.4″ to 37.4″. On 21st, at 3:00 p. m., stationary; on 23d, at 2:05 p. m., 4° 37′ north of the moon. It might be observed in passing that as a mean result of five years’ observations at the Dearborn Observatory, Chicago, the time of Jupiter’s rotation has been discovered to be greater by three seconds than was supposed in 1879.