Popular Astronomy, Volume 8; Volume 1900

Algol Allegheny Observatory angle aperture appear astronomical Astrophysical axis bright chart circle clouds College comet coördinates corona craters curve Cygni determined diameter Director discovery distance double stars Earth ephemeris equator equatorial Eros Euclid exposure faint geometry give given Greenwich Harvard College Observatory Herculis hour hour angle inches instrument interest July Jupiter lens Leonids Lick Observatory light magnitude Mars means measures Mercury meridian meteors micrometer minima Moon Moon's motion nebula non-Euclidean geometry objects observations obtained orbit parallax period perpendicular photographic planet plate polar POPULAR ASTRONOMY position Professor Keeler reflector refractor right ascension satellite Saturn seen Sept shadow bands solar solar eclipse spectra spectroscopic spectrum SS Cygni straight Sun's surface telescope tion total eclipse triangle University VARIABLE STARS Venus visible Yerkes Yerkes Observatory