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07/11/1631 Closest planet is found

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Transit of Mercury

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NASA's SDO Captures Mercury Transit Time-lapse

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Mercury transit 2016: Planet about to make rare appearance as it moves across the sun - TomoNews

French astronomer Pierre Gassendi observed the transit of Mercury for the first time in history. The phenomenon was predicted by Johannes Kepler. Gassendi was surprised that Mercury looked so small. Each century there are approximately 13 transits of Mercury. In 2014 Curiosity rover observed Mercury transit from Mars.
    • Essentials 

    • Past and future transits