On 1 September 1420 a mega-thrust earthquake occurred offshore Atacama, Chile. The seismic event had an estimated moment magnitude (Mw) between 8.8 and 9.4.
The estimated primary trigger of this seismic event is the Earth-Mercury-Saturn conjunction in combination with opposing lunar right angles on 31 August and 1 September 1420.
From 24 to 31 August a series of eleven planetary conjunctions occurred whereby three times a convergence of two conjunctions occurred on 28, 29 and 30 August. The only conjunction not cosidered critical is Mars-Sun-Saturn on 26 August. The series of planetary conjunctions occurred due to the near conjunction of the Sun, Mercury, Earth, Mars, Saturn and Uranus, with Saturn and Uranus on opposite sides of the Solar System. As a result, three opposing lunar right-angles occurred involving Mars, Saturn and Uranus from 31 August to 2 September. This type of lunar geometry is known to induce major to great earthquakes (see also 1905, 1906, 2012, 2015).
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Mercury-Mars-Uranus 1420-08-24, 3:00:12 350°39'45" Venus-Sun-Neptune 1420-08-25, 23:37:27 120°04'34" Mars-Sun-Saturn 1420-08-26, 20:15:57 177°29'10" Sun-Earth-Uranus 1420-08-27, 21:54:59 351°03'27" Mercury-Earth-Uranus 1420-08-28, 10:33:26 351°02'11" Mercury-Sun-Uranus 1420-08-28, 18:50:19 351°04'01" Mercury-Sun-Earth 1420-08-29, 1:02:17 352°09'32" Mars-Mercury-Saturn 1420-08-29, 6:35:14 177°45'07" Sun-Mercury-Saturn 1420-08-30, 8:43:20 177°36'18" Mercury-Sun-Mars 1420-08-30, 23:27:54 0°03'52" Earth-Mercury-Saturn 1420-08-31, 21:36:09 177°23'51" Earth-Sun-Saturn 1420-09-03, 18:29:56 177°45'14" Mercury: Earth-Neptune 1420-08-25, 1:50:39 135°00'00" Mercury: Venus-Saturn 1420-08-26, 4:57:47 135°00'00" Sun: Mercury-Neptune 1420-08-27, 9:45:44 45°00'00" Sun: Mercury-Venus 1420-08-28, 4:56:39 135°00'00" Venus: Earth-Uranus 1420-08-28, 6:21:59 45°00'00" Mercury: Venus-Jupiter 1420-08-28, 10:51:07 135°00'00" Venus: Mars-Neptune 1420-08-28, 23:55:51 90°00'00" Sun: Venus-Uranus 1420-08-29, 18:47:17 45°00'00" Venus: Earth-Saturn 1420-08-29, 21:58:02 135°00'00" Venus: Mercury-Jupiter 1420-08-31, 13:16:09 45°00'00" Sun: Venus-Earth 1420-09-01, 18:26:57 45°00'00" Sun: Mercury-Jupiter 1420-09-02, 3:56:31 90°00'00" Sun: Venus-Saturn 1420-09-02, 23:46:52 135°00'00" Mercury: Mars-Jupiter 1420-09-02, 23:52:30 90°00'00" Earth-Moon-Mars 1420-08-26, 8:41:16 15°53'53" Moon-Earth-Venus 1420-08-28, 0:51:52 217°23'33" Earth-Moon-Jupiter 1420-09-02, 23:14:23 108°53'58" Earth: Moon-Neptune 1420-08-27, 13:45:05 90°00'00" Earth: Moon-Uranus 1420-08-27, 22:19:00 45°00'00" Earth: Moon-Mars 1420-08-29, 21:21:03 45°00'00" Earth: Moon-Jupiter 1420-08-30, 3:32:18 45°00'00" Earth: Moon-Neptune 1420-08-31, 6:09:50 45°00'00" Earth: Moon-Uranus 1420-08-31, 14:46:51 90°00'00" Earth: Moon-Saturn 1420-09-01, 3:57:11 90°00'00" Earth: Moon-Mars 1420-09-02, 14:08:54 90°00'00"