On 11 October 1138 a major earthquake occurred at Aleppo. The seismic event occurred in the afternoon and had an estimated moment magnitude (Mw) 7.1.
The estimated trigger of this seismic event is a convergence of planetary conjunctions coinciding with a high lunar peak on 4 October, followed by four additional planetary conjunctions with Venus from 6 to 10 October with high lunar peaks on 8 and 11 October.
In the days leading up to the earthquake, Venus was a key player with five planetary conjunctions from 4 to 10 October. A major convergence of planetary and lunar geometry occurred on 4 October; two planetary conjunctions Sun-Mercury-Saturn and Sun-Venus-Neptune less than an hour apart converged with a lunar conjunction involving Jupiter, while the Moon made semi-right angles with Saturn, Uranus and Neptune. On 6 October the planetary conjunction Mars-Venus-Uranus was followed by a lunar conjunction with the Sun (New Moon). On 7 October the planetary conjunction Sun-Venus-Uranus was followed by two lunar conjunctions, also involving Venus, and Neptune. Several hours later on 8 October the next lunar conjunction with Uranus occurred, followed by a planetary right angle involving Venus. On 9 and 10 October two more planetary conjunctions involving Venus converged with the critical lunar conjunction Moon-Earth-Mars. Finally, in the morning of 11 October, several lunar semi-right angles occurred involving all four Jovians, which resulted in a high lunar peak. According to historical accounts the earthquake was preceded by a foreshock a day earlier.
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Mars-Sun-Uranus 1138-10-04, 11:21:41 227°50'01" Sun-Mercury-Saturn 1138-10-04, 12:25:53 320°06'09" Sun-Venus-Neptune 1138-10-04, 13:39:07 223°13'17" Mars-Venus-Uranus 1138-10-06, 7:46:14 227°55'48" Sun-Venus-Uranus 1138-10-07, 11:25:01 227°52'14" Venus-Sun-Mars 1138-10-09, 0:43:49 50°21'16" Earth-Venus-Neptune 1138-10-10, 18:35:18 223°01'02" Mercury-Sun-Jupiter 1138-10-13, 23:02:09 179°30'34" Sun: Venus-Jupiter 1138-10-04, 22:41:20 45°00'00" Mercury: Venus-Mars 1138-10-05, 21:15:42 135°00'00" Venus: Earth-Jupiter 1138-10-06, 14:30:46 135°00'00" Mercury: Jupiter-Neptune 1138-10-08, 12:27:22 45°00'00" Sun: Venus-Saturn 1138-10-08, 23:02:14 90°00'00" Sun: Mercury-Earth 1138-10-12, 10:02:46 45°00'00" Venus: Mercury-Jupiter 1138-10-13, 2:24:58 135°00'00" Sun: Mercury-Neptune 1138-10-13, 16:49:46 135°00'00" Venus: Mars-Saturn 1138-10-13, 19:23:45 90°00'00" Earth-Moon-Jupiter 1138-10-04, 17:20:21 183°26'02" Earth-Moon-Sun 1138-10-06, 23:42:53 211°51'53" Earth-Moon-Venus 1138-10-07, 12:59:16 218°58'00" Earth-Moon-Neptune 1138-10-07, 20:18:10 222°54'31" Earth-Moon-Uranus 1138-10-08, 4:06:41 227°08'19" Earth-Moon-Mercury 1138-10-08, 20:02:55 235°50'35" Moon-Earth-Mars 1138-10-10, 12:12:54 78°12'20" Earth: Moon-Neptune 1138-10-04, 6:17:04 45°00'00" Earth: Moon-Saturn 1138-10-04, 9:39:43 135°00'00" Earth: Moon-Uranus 1138-10-04, 14:23:35 45°00'00" Earth: Moon-Neptune 1138-10-11, 5:31:55 45°00'00" Earth: Moon-Venus 1138-10-11, 6:36:01 45°00'00" Earth: Moon-Saturn 1138-10-11, 8:14:55 45°00'00" Earth: Moon-Uranus 1138-10-11, 13:03:53 45°00'00" Earth: Moon-Jupiter 1138-10-11, 17:25:43 90°00'00"