Space ExplorationUpcomingFeatured
Total Solar Eclipse 2026
Count down to the dramatic total solar eclipse that will sweep across Greenland, Iceland, and Spain.
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Track countdowns to one-time or milestone events, and see how long it's been since historical moments.
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HistoryPastFeatured
Apollo 11 Moon Landing
Relive the first time humans set foot on the Moon and track how long it's been since that moment.
Time Since
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AstronomyUpcoming
Halley's Comet Return
Follow the long countdown to the next perihelion of Halley's Comet in 2061.
Countdown