Annals of the Astrophysical Observatory of the Smithsonian Institution Volume 3

Annals of the Astrophysical Observatory of the Smithsonian Institution Volume 3

By (author) 

List price: US$17.62

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks


This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...the factor determined for Mount Wilson from the whole year, s observations of 1911 has been employed. As indicated in Chapter III, we feel some doubt as to the applicability of the secondary water-vapor corrections to individual days, although convinced of their applicability to the results in general. Hence, in order to reduce as much as possible the magnitudes of these somewhat uncertain water-vapor corrections, we have reduced the Mount Wilson results to a mean constant quantity (7 mm.) of precipitable water, and the Bassour results to a different mean constant quantity (14 mm.), chosen in each case to represent the mean conditions of 1912. If it is desired to reduce still further the mean results to a condition of zero water vapor, we should add 0.013 calorie to the mean values of Mount Wilson and probably 0.026 calorie to those of Bassour. i Day rejected for bad bolometry at one or both stations. Day rejected for bad sky at one or both stations. Table 39.--Comparison of conditions of observation, 1911. Mount Wilson work. Bassour work. Date. Sky conditions. Smoky in west; otherwise good. Hazy Excellent Smoke and cirri south and west; otherwise good. Thick cirri south and west; very milky; variable. Cirri east; belated start; variable. Milky; windy Milky Faint cirri low south; milky Excellent Excellent Excellent Cirri low east; otherwise excellent. Thick cirri south and east, but below sun. Cirri low south and east Faint streaks east Cirri low in south Excellent Milky Milky Rather hazy Cirri south and east, below sun. Many cirri south and west. Cirri not near sun till in end stopped series. Excellent Excellent Cirri low south and east; otherwise excellent. Cloudless until end, then cirri from west. Milky Sky conditions. more

Product details

  • Paperback
  • 189 x 246 x 4mm | 154g
  • United States
  • English
  • black & white illustrations
  • 1236871502
  • 9781236871503