Page:Star Lore Of All Ages, 1911.pdf/589

Rh {| class="star-numbers"
 * + NUMBER OF THE STARS
 * Magnitude
 * 20
 * 65
 * 200
 * 500
 * 1400
 * 5000
 * Seventh
 * 20000
 * 68000
 * 240000
 * style="border-bottom:1px solid;" | 720000
 * 1,055,185
 * }
 * 500
 * 1400
 * 5000
 * Seventh
 * 20000
 * 68000
 * 240000
 * style="border-bottom:1px solid;" | 720000
 * 1,055,185
 * }
 * Seventh
 * 20000
 * 68000
 * 240000
 * style="border-bottom:1px solid;" | 720000
 * 1,055,185
 * }
 * 240000
 * style="border-bottom:1px solid;" | 720000
 * 1,055,185
 * }
 * style="border-bottom:1px solid;" | 720000
 * 1,055,185
 * }
 * style="border-bottom:1px solid;" | 720000
 * 1,055,185
 * }

The lucid, or naked-eye, stars comprise the first six magnitudes.

A 5″ telescope reveals stars down to the 12th magnitude, and Prof. Ritchey of the Mt. Wilson Observatory using the new 60″ reflector has photographed by four-hour exposures stars probably as faint as the 20th or 21st magnitude. It has been estimated that the total number of stars within our ken photographically speaking is possibly 125 million.