Duration |
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| 1820 Oct 17 | S of Sinus Iridum | Brilliant spots in Mare Imbrium S of Sinus Iridum | Luthmer | Luthmer 1824 |
| 1821 Feb 5-6 | Aristarchus, vicinity | Luminous appearance on dark side; 6th to 7th mag, 3' to 4' diameter | Kater, Olbers, Browne | Kater 1821; Olbers 1822, 1824; Gauss 1874; Houzeau and Lancaster 1964 ed. |
| 1821 Apr 7 | Posidonius | Appeared without shadow | Gruithuisen | Webb 1962 ed., p.110 |
| 1821 May 4-6 | Aristarchus, vicinity | Bright spot on dark side, <1' diameter | Ward, Baily | Ward 1822; Baily 1822 |
| 1821 Jul 25 | Dark side | Brilliant flashing spots | Gruithuisen | Gruithuisen 1824 |
| 1821 Nov 28, ~20h00m | Dark side | Variable bright spot like 6th mag star | Fallows | Fallows 1822 |
| 1822 Jan 27 | Aristarchus, vicinity | Bright spot like 8th mag star | F.G.W. Struve | Struve 1823 |
| 1822 Jun 22-23 | Aristarchus | Lunar "volcano" | Ruppell | Ruppell 1822 |
| 1822 | N/A | "Volcanoes" on the moon; several occasions | Flaugergues | Flaugergues 1822 |
| 1822 | N/A | Lunar "volcano" | Zach | Zach 1822 |
| 1824 May 1 | Near Aristarchus | Blinking light, 9th to 10th mag on dark side | Gobel | Gobel 1826 |
| 1824 Oct 18 | Aristarchus, vicinity | Mingling of all kinds of colors in small spots in the W and NW of Aristarchus | Gruithuisen | Gruithuisen 1824; Fauth 1899 |
| 1824 Oct 20, 05h00m | Dark side, Mare Nubium | Bright area 100 x 20 km | Gruithuisen | Flammarion 1884; Azevado 1962 |
| 1824 Dec 8 | Plato | Bright fleck in SE part of crater | Gruithuisen | Sirius 1879 |
| 1825 Apr 8 | Plato | W part of crater brighter than E part | Gruithuisen | Sirius 1879 |
| 1825 Apr 22 | Aristarchus and vicinity | Periodic illumination | Argelander, Gobel | Argelander 1826, Gobel 1826 |
| 1825 Dec 1, 23h45m | Ptolemaeus | Bright spot | Schwabe | Sel.J. 1880 |
| 1826 Apr 12, 20h00m | Mare Crisium | Black moving haze or cloud | Emmett | Emmett 1826; Capron 1879 |
| 1826 Apr 13, 20h00m | Mare Crisium; 1 hr | Cloud less intense | Emmett | Capron 1879 |
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