Popular Astronomy, Volume 39

American Astronomical Society appeared April August brightness calendar clock comet computed curve CYGNI December distance earth east eclipse ephemeris Est.Obs faint feet fireball galactic Gegenschein Harvard College Observatory horizon instruments J.D.Est J.D.Est.Obs January June Jupiter Leonids Lick Observatory longitude magnitude meteorite meteors Miss month moon will occur motion Mount Neptune November Observatory orbit pendulum period Perkins Observatory perturbation photographic planet plates Pluto POPULAR ASTRONOMY Professor radial velocities reflector refractor right ascension solar spectrograph SS CYGNI STAR OBSERVATIONS RECEIVED stellar telescope tion University Uranus VARIABLE STAR OBSERVATIONS velocity visible Zodiacal Light