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Published on Jan 4, 2007
This is a short clip made from a series of shorter clips of the transit of Venus in 2004. The black disc is the planet Venus, and the white background disc is the Sun, seen through a solar filter. Transits come in pairs, eight years apart, every 120 years or so, so these are one of the rarest Astronomical events (much rarer than solar eclipses for example). The disc did actually glide in a line in fron of the Sun, not in the slightly zig-zaggy way seen here (due to positioning of scope in each shot).