Contributions from the Lick Observatory Volume 2

Contributions from the Lick Observatory Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ...and to refer to the drawings for its proof. If this be so, such changes observed at future lunar eclipses may be at once referred to the same cause. We may point out, what indeed is obvious, that these observations are exactly suited to be the basis of a thoroughgoing photometry of the Moon's surface, and that it may be well to observe a few more lunar eclipses in the same manner for the sake of comparison. NAKED-EYE DRAWINGS. By Edward S. Holden. In the intervals of observation with the large telescope, I made eleven sketches with the naked eye. On each sketch I marked the boundaries of the regions of differing color or shade. Mr. Keeler also made a drawing with the naked eye. The sketches have been copied carefully onto blue prints from a negative of the uneclipsed Moon, made by Mr. Barnard immediately after totality, with the 12-inch equatorial. It will be noticed that in general the lines of demarkation referred to seem to follow lines of topographic or photometric difference on the Moon's surface. There appear to be few exceptions to this, and it seems that the "wedge-shaped" shadow and the curious interior forms observed at this and at other lunar eclipses are shown by these naked-eye drawings alone to be caused mainly by differences of reflecting power in the various parts of the Moon's surface. These drawings follow Plate B (Figures 44 to 55). Some of the copies of Plate B are not satisfactory. Notes (See Plate B). Figure 44. 8" 26." P. S. T. A--dull chocolate red. B--brighter chocolate red. C--full moonlight. The arrangement of color, as described, was first noticed at S" 26m, but may have existed previously. 45.. A-=darker. B--bright chocolate red, inclining to cop per color. C--full moonlight. Hh 53m, more

Product details

  • Paperback | 80 pages
  • 189 x 246 x 4mm | 159g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236604644
  • 9781236604644