Popular Astronomy, Volume 39

amateur AMERICAN ASTRONOMICAL SOCIETY appeared April Aries Began Ended Total brightness clock comet computed curve CYGNI December distance earth eclipse Ended Total Meteors ephemeris Est.Obs faint fireball galactic globular clusters Harvard College Observatory instruments J.D.Est J.D.Est.Obs January June Jupiter latitude Leonids Lick Observatory longitude magnitude meteorite meteors miles month moon will occur motion Mount nebulae Neptune November Observatory orbit pendulum period Perkins Observatory perturbation photographic planet plates Pluto POPULAR ASTRONOMY Professor radial velocities reflector refractor right ascension Saturn solar spectrograph SS CYGNI STAR OBSERVATIONS RECEIVED stellar telescope tion University Uranus VARIABLE STAR OBSERVATIONS velocity visible Zodiacal Light