_250x180.gif "umbra eclipse definition")
#Umbra eclipse definition full
PST, the partial phase of the eclipse will begin as the Earth's dark shadow - called the umbra - starts to slowly creep over the face of the full moon. The most interesting parts occur when the moon plunges into Earth's full shadow, called the umbra, and of course during the period of totality. The center of these spots is as black as a brunette cat, and is called the umbra, so called because it resembles an umbrella. The History of the Decline and Fall of the Roman Empire 1206
1845.] 37 Feralis umbra, is the expression of Tacitus: it is surely a very bold one.] 38 Tacit. Think Progress » Legal Expert: Congress Can’t Rubber Stamp Military Commissions Without Endangering U.S. June 30th, 2006 at 10: 41 pm purvis ames says: umbra is mighty aphrodite. Human Rights Official For Criticizing Flawed Administration Policies 2006 Nevermind the weather when you have an umbrella Kate Ravilious 2010įlavius this guy umbra is violent and scares the hell out of me. The word umbrella comes from the Latin word " umbra", meaning shade or shadow. noun a region of complete shadow resulting from total obstruction of light.noun astronomy The central region of a sunspot.įrom WordNet 3.0 Copyright 2006 by Princeton University.The juice of its berries is used for coloring wine.įrom Wiktionary, Creative Commons Attribution/Share-Alike License. It has large dark leaves, and a somber aspect. It is native of South America, but is now grown in southern Europe. noun (Bot.) a tree ( Phytolacca dioica) of the same genus as pokeweed.noun (Zoöl.) Any one of several species of sciænoid food fishes of the genus Umbrina, especially the Mediterranean species ( Umbrina cirrhosa), which is highly esteemed as a market fish - called also ombre, and umbrine.
noun The fainter part of a sun spot - now more commonly called penumbra.noun The central dark portion, or nucleus, of a sun spot.noun The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk - used in contradistinction from penumbra.See cut under Umbrina.įrom the GNU version of the Collaborative International Dictionary of English. noun A sciænoid fish, Umbrina cirrosa the umbrine.Every time the Sun goes down, we delve into the darkness created by Earths umbra. In fact, we travel through it quite regularly. There are two species, respectively of Europe and North America, U. Like the Moon, Earth always casts an umbra. noun The only genus of Umbridæ the mud-minnows.noun In algebra, a symbol which, when paired with another, makes the symbol of a quantity.noun Among the Romans, one who went to a feast merely at the solicitation of one invited: so called because he followed the guest as a shadow. During a total lunar eclipse the Moon is completely covered by the darkest portion of Earths shadow, known as the umbra.noun The completely dark central portion of the shadow cast by the earth, moon, or other body during an eclipse.noun A dark area, especially the blackest part of a shadow from which all light is cut off.Refraction and scattering do not interfere with it being a geometrical eclipse, it just affects the experience and effects.From The American Heritage® Dictionary of the English Language, 5th Edition. The inner black circle is the umbra, within which the Earth entirely blocks the Suns light, and where the Moons disk would appear entirely unilluminated. That will stop most of the light, but as you point out B can refract or scatter, so that light has other paths available to it besides straight lines in vacuum. In other words, there are some lines drawn from the surface of A to point C or to areas on C's surface that intersect B. No matter, the eclipse is a geometrical effect where B comes between C and A and at least partially blocks C's view of A. point C, it could be a point or tiny object like a spacecraft, or it could be an extended object like the Moon. Sun and Earth)įor the location where the eclipse "happens" i.e. I suppose you can leave it at that and have a mathematical eclipse when they're co-linear but I think we need a definition that involves realistic sizes for the light source and the occluding/eclipsing body. Eclipses can be thought of as geometrical phenomena involving three points. Can be a challenge, because any definition can be by itself "exact" even if wrong or disputed, and the premise of using the word "The" is that there can be only one which, really, there are probably more.īut we can certainly propose a clear and unambiguous definition that will work for most people and most cases.
0 kommentar(er)
