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I have just been reading the June BAA Journal which arrived this morning.
Apparently in the year 571,741 there will be a simultaneous transit of Earth
and Venus, as viewed from Mars.

Not sure whether this is AD or not.

Roger



Brings up an interesting point- would a simultaneous transit of Venus
and Mercury as seen from Earth be possible?
If so, how often would it occur?
When's the next one? :-)
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