https://en.believethesign.com/index.php?action=history&feed=atom&title=File%3ATwo_Circular_Clouds_1963.jpgFile:Two Circular Clouds 1963.jpg - Revision history2026-05-02T00:22:12ZRevision history for this page on the wikiMediaWiki 1.43.8https://en.believethesign.com/index.php?title=File:Two_Circular_Clouds_1963.jpg&diff=27335&oldid=prevMitgrant: This photograph, part of James E. McDonald's 1963 investigation, clearly shows two distinct circular cloud features over the Flagstaff, Arizona area on February 28, 1963. The larger, brighter ring is the main structure documented at approximately 43 km altitude. Below and behind it (in the distance) is a fainter, trailing ring or puff-like formation, identified by McDonald as a separate "smoke ring" at roughly 26 km altitude. This image is one of many multi-angle photos McDonald used to perfo...2026-03-06T00:33:31Z<p>This photograph, part of James E. McDonald's 1963 investigation, clearly shows two distinct circular cloud features over the Flagstaff, Arizona area on February 28, 1963. The larger, brighter ring is the main structure documented at approximately 43 km altitude. Below and behind it (in the distance) is a fainter, trailing ring or puff-like formation, identified by McDonald as a separate "smoke ring" at roughly 26 km altitude. This image is one of many multi-angle photos McDonald used to perfo...</p>
<p><b>New page</b></p><div>== Summary ==<br />
This photograph, part of James E. McDonald's 1963 investigation, clearly shows two distinct circular cloud features over the Flagstaff, Arizona area on February 28, 1963. The larger, brighter ring is the main structure documented at approximately 43 km altitude. Below and behind it (in the distance) is a fainter, trailing ring or puff-like formation, identified by McDonald as a separate "smoke ring" at roughly 26 km altitude. This image is one of many multi-angle photos McDonald used to perform trigonometric calculations of height and separation.</div>Mitgrant