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Lunar Saros 148
Saros cycle series 148 for lunar eclipses occurs at the moon's ascending node, 18 years 11 and 1/3 days. It contains 70 events. See also * List of lunar eclipses ** List of Saros series for lunar eclipses Notes External links www.hermit.org: Saros 148 {{Lunar eclipses Lunar saros series ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penumbral Lunar Eclipse Aug 6 2009 John Walker
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an Opacity (optics), opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast. These names are most often used for the shadows cast by celestial body, celestial bodies, though they are sometimes used to describe levels, such as in sunspots. Umbra The umbra (Latin for "shadow") 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 eclipse. The umbra of a round body occluding a round light source forms a cone, right circular cone. When viewed from the cone's apex (geometry), apex, the two bodies angular diameter, appear the same size. The lunar distance (astronomy), distance from the Moon to the apex of its umbra is roughly equal to that between the Moon and Earth: . Since Earth's diameter i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
