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Lunar Saros 143
Saros cycle series 143 for lunar eclipses occurs at the moon's descending node, repeats every 18 years 11 and 1/3 days. It contains 72 events. List See also * List of lunar eclipses ** List of Saros series for lunar eclipses Notes External links www.hermit.org: Saros 143 {{Lunar eclipses Lunar saros series ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penumbral Lunar Eclipse Feb 9 2009 NavneethC
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object of lesser size. In cases of equal or smaller impinging objects, only an umbra and penumba are generated. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast. These phenomena are generally observed within solar systems, as the size of the stars within the system are larger than the orbiting satellites, hence these terms are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels of darkness, such as in sunspots. Umbra The umbra () is the innermost and darkest part of a shadow, where the light source is completely blocked by the occluding body. An observer within the umbra experiences a total occultation. The umbra of a round body occluding a round light source forms a right circular cone. When viewed from the cone's apex, the two bodies ap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
