Transit of Venus: June 56, 2012 - Observing Highlights - SkyandTelescope.com - 0 views
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combined 17 exposures taken at 20-minute intervals to create this sequence from the transit of Venus in June 2004.
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transit of Venus, happens only four times every 243 years
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spacing between each occurrence is very uneven: it's 121½ years, then 8 years, then 105½ years, then 8 years again
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