Duration |
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| 1931 Feb 22 | Aristarchus | Reddish-yellow | Joulia | Joulia 1931 |
| 1931 Mar 27 | Tycho | Central mountain gray although crater interior was in full shadow | Barker | Moore 1953; Green 1965 |
| 1931 | Aristarchus | Bluish glare | Goodacre, Molesworth | Goodacre 1931 |
| 1932 Apr 15, 06h57m | Plato | Sudden appearance of white spot like cloud | Goddard and friend | Pop. Astr. 1932 |
| 1933 Mar 30 | Aristarchus region | White | Douillet | Douillet 1933 |
| 1933 Sep 1 | Neighbourhood of Pico, and Pico B | Haze observed | Rawstron | Rawstron 1937 |
| 1933 Oct 1 | Neighbourhood of Pico, and Pico B | Haze observed | Rawstron | Rawstron 1937 |
| 1936 May 4 | Eratosthenes | Detected small bright spots on crater floor | Martz | Haas 1942 |
| 1936 Oct 4 | Eratosthenes | Many small bright spots on crater floor, some of which Martz detected, but Johnson drew bright bands in their positions | Haas | Haas 1942 |
| 1936 Oct 25 | Eratosthenes | Small bright spots on floor of crater | Haas | Haas 1942 |
| 1937 Feb 14 | Cassini | Bright spot | Andrenko | Azevado 1962 |
| 1937 Sep 17 | Aristarchus | Bright streak | H.M. Johnson | Haas 1942 |
| 1937 Sep 28 | Riccioli | Color of dark area was deep purple; next night same with vivid hue | Haas | Haas 1942 |
| 1937 Oct 26 | Alphonsus, Herschel, and Ptolemaeus | Milky floors | Alter | Alter 1959 |
| 1937 Dec 12 | Plato | Strongly marked streak of orange-brown on E wall | Barker | Barker 1940 |
| 1938 Jan 16-17 | Plato | Brownish gold-veined surface of color irregularly laid on smooth floor of crater | Barker | Barker 1940 |
| 1938 Feb 14 | Plato | Golden-brown spot on E wall very prominent, with a yellowish glow without a definite boundary spreading over floor of crater | Fox | Barker 1940 |
| 1939 Feb 23 | Aristarchus | Bright spot | Andrenko | Azevado 1962 |
| 1939 Mar 29, 19h00m | Copernicus; 15 min | Central mountain group seen distinctly as diffuse light spot. Sunrise on peaks did not begin until 22h00m | Wilkins | Wilkins 1954 |
| 1939 Aug 2, 00h10m | Schickard | Dense fog | Moore | Wilkins and Moore 1958; Firsoff 1962 ed., p.80 |
| 1939 Oct 19 | Macrobius | Floor of crater reddish-brown, a hue ordinarily absent | Barcroft | Haas 1942 |
| 1939 Dec 27 | Aristarchus | Slight bluish tinge on the still brilliant W wall | Barcroft | Haas 1942; Firsoff 1962 ed., p.84 |
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