Flight of Birds Across the Moon's Disc

Details Flight of Birds Across the Moon's Disc Flight of Birds Across the Moon's Disc

Dec 1895

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1895natur..53..131w&link_type=abstract

Nature, Volume 53, Issue 1363, pp. 131 (1895).

Physics

Scientific paper

ON the evening of October 7, 1895, while observing the passage of the moon through the Pleiades for occultations, my attention was attracted by a flight of birds across the moon's disc. This continued with more or less regularity the whole time I was at work, from 7.30 to 9.30, the birds usually crossing singly, but sometimes in groups of two, three, or even four. In all, I saw perhaps 50 or 60; assuming a like frequency during the intervals when I was not at the telescope, from 200 to 250 must have crossed the disc during the two hours. All were flying south with a single exception. Their outlines and the flapping motions of their wings were very distinct; none were soaring. The telescope is a 12-inch refractor: eyepiece of power 90. The moon was low, its altitude ranging from 5° 15°.

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