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Original message: On the night of Wednesday, December 7th/Morning of Thursday December 8th, Earth's Moon passed directly in front of Mars for observers in the highlighted areas of this graph. The event coincided with the opposition of Mars, when it should (theoretically!) be at its closest point to Earth. Using the difference in timing of the event at different locations around the Earth, it should be possible to calculate the distance to Mars using parallax. Thanks to the effort of a few of our forum members, timing data was gathered from three distant points across the world! California: Mars Disappearance: Halfway ~18:34:54.3 PST = ~02:34:54.3 UTC Fully Set 18:35:18.4 PST = 02:35:18.4 UTC Mars Appearance: Halfway ~19:35:39.5 PST = ~03:35:39.5 UTC Fully Risen 19:36:02.6 PST = 03:36:02.6 UTC Minnesota: Mars Disappearance: Beginning 03:03:10.7 UTC Fully Set 03:03:58.0 UTC Mars Appearance: Beginning 04:09:27.7 UTC Fully Risen 04:10:06.8 UTC Derbyshire: Mars Disappearance: Beginning 04:57:02:82 UTC Fully Set: --- Mars Appearance: First Seen 05:57:11:09 UTC Fully Risen 05:57:36:71 UTC Thanks to @K^2 and @Starshot for participating and providing this data! I will not get around to the math on this right away because of other obligations, but I will probably have some results to post here by the end of the year!