Popular Astronomy, Volume 39

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