Transit o Venus

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The sun in false-colour yellae, as seen in the 171 ångström wavelenth, wi Venus in the tap-right quadrant.
171 ångströms (17.1 nm)
The sun in orange, as seen frae the veesible spectrum, wi Venus in the tap left quadrant.
Continuous visible spectrum.
False-colour ultraviolet an veesible spectrum images o the 2012 transit o Venus, as taken frae NASA's Solar Dynamics Observatory.

A transit o Venus athort the Sun taks place when the planet Venus passes directly atween the Sun an a superior planet, acomin veesible against (an hence obscurin a small portion o) the solar disk.