Links
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A forecast of when Blackwell, Texas will have good weather for astronomical observation with links to Sun and Moon data, star charts, and satellite predictions.
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A medium for advancing and conducting astronomical work by both professional and amateur astronomers who share an interest in solar system obervations.
- A free mathematics competition open to all United States middle school and high school students primarily sponsored by the National Security Agency .
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A mathematics honor society for students at United States high schools and two year colleges.
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A national academic honors program for high school students emphasizing leadership, service, and scholarship.