Umbra 358370-040 Hub Wall Mirror With Rubber Frame - 37-Inch Round Wall Mirror for Entryways, Washrooms, Living Rooms and More, Doubles as Modern Wall Art, Black 4.7 out of 5 stars 3,682 $125.98 $ 125. 98 $150.00 $150.00. Lavish Home Lawrence Frames LEGO Life Moments Lillian Rose Loft by Umbra Lorell Los Angeles Chargers Los Angeles Dodgers Los Angeles Rams Made By Design MCS Melrose Merkury Innovations Miami Dolphins Minnesota Vikings Minnie Mouse MLB Monogram International MyOfficeInnovations New England Patriots New Orleans Saints New View New York Giants New. Umbra definition is - a conical shadow excluding all light from a given source; specifically: the conical part of the shadow of a celestial body excluding all light from the primary source. How to use umbra.
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an 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 bodies, though they are sometimes used to describe levels, such as in sunspots.
Umbra[edit]
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 right circular cone. As viewed from the cone's apex, the two bodies appear the same size. The distance from the Moon to the apex of its umbra is roughly equal to that between the Moon and Earth: 384,402 km (238,856 mi). Since Earth's diameter is 3.70 times the Moon's, its umbra extends correspondingly farther: roughly 1,400,000 km (870,000 mi).[1]
Penumbra[edit]
The penumbra (from the Latin paene 'almost, nearly') is the region in which only a portion of the light source is obscured by the occluding body. An observer in the penumbra experiences a partial eclipse.An alternative definition is that the penumbra is the region where some or all of the light source is obscured (i.e., the umbra is a subset of the penumbra). For example, NASA's Navigation and Ancillary Information Facility defines that a body in the umbra is also within the penumbra.[2]
Antumbra[edit]
The antumbra (from Latin ante, 'before') is the region from which the occluding body appears entirely within the disc of the light source. An observer in this region experiences an annular eclipse, in which a bright ring is visible around the eclipsing body. If the observer moves closer to the light source, the apparent size of the occluding body increases until it causes a full umbra.[3]
See also[edit]
References[edit]
- ^Pogge, Richard. 'Lecture 9: Eclipses of the Sun & Moon'. Astronomy 161: An Introduction to Solar System Astronomy. Ohio State University. Retrieved July 16, 2015.
- ^Event Finding Subsystem Preview Navigation and Ancillary Information Facility.
- ^'Eclipses: What Is the Antumbra?'. timeanddate.com. Retrieved 26 May 2019.
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