On 1 June 1906 a major earthquake occurred in Irian Jaya, Indonesia at a depth of 35 km. The seismic event occurred at 04:30:50 UTC and had an estimated moment magnitude (Mw) 7.8.
As with other major earthquakes in 1905 and 1906, the Moon made critical geometry with the outer planets Uranus and Neptune, which were on opposite sides of the solar system. This time two lunar conjunctions occurred on 26 May involving both planets within 2 hours. Critical planetary geometry occurred on 25 May with the Mercury-Mars-Neptune conjunction. Early on 1 June the Venus-Mercury-Saturn conjunction occurred while Venus was also in close conjunction with Earth and Uranus and also with Earth and Neptune, which tells us that Earth and Venus were in very close conjunction with Uranus and Neptune at that time. On 31 May a lunar conjunction with Saturn occurred, after which the earthquake occurred.
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Mercury-Mars-Neptune 1906-05-25, 4:57:54 101°51'42" Venus-Mercury-Saturn 1906-06-01, 1:22:18 338°19'12" Venus-Earth-Uranus 1906-06-01, 23:47:24 278°51'24" Earth-Venus-Neptune 1906-06-03, 5:47:15 100°21'56" Earth-Moon-Venus 1906-05-25, 18:06:33 90°06'02" Moon-Earth-Uranus 1906-05-26, 12:01:53 279°04'18" Earth-Moon-Neptune 1906-05-26, 14:06:27 100°06'52" Moon-Earth-Saturn 1906-05-31, 18:56:30 345°47'56"