National Aeronautics and Space Administration

Goddard Space Flight Center

Sun-Earth Day 2010: Ancient Mysteries, Future Discoveries

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Sun Watchers Through Time

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NASA Fact

Transits and eclipses are rare celestial events. Transits of Venus allow astronomers to calculate more accurately the distance of Venus from the Sun, and subsequently the distances of other planets. One can see the corona or atmosphere of the Sun safely with naked eyes only during a total solar eclipse.