Daily Archives: April 26, 2009

Zenith and Nadir

Posted on April 26, 2009 by

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 →

Posted in Class Notes, Geography Practicals/Lab and Statistical Techniques, Solar System | 3 Comments

Celestial coordinate system

Posted on April 26, 2009 by

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 | 2 Comments

World on alert as Mexico flu epidemic fear grows

Posted on April 26, 2009 by

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 →

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