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Daily Archives: April 26, 2009
Zenith and Nadir
The zenith is the direction pointing directly above a particular location (perpendicular, orthogonal). Since the concept of being above is itself somewhat vague, scientists define the zenith in more rigorous terms. Specifically, in astronomy, geophysics and related sciences (e.g., meteorology), … Continue reading
Celestial coordinate system
Celestial coordinate system is a coordinate system for mapping positions on the celestial sphere. There are different celestial coordinate systems each using a system of spherical coordinates projected on the celestial sphere, in analogy to the geographic coordinate system used … Continue reading
Posted in Solar System
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World on alert as Mexico flu epidemic fear grows
Governments around the world rushed on Sunday to check the spread of a new type of swine flu that has killed up to 81 people in Mexico and infected around a dozen in the United States.Mexicans huddled inside their homes … Continue reading
Posted in News
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