1) " Sun" -- As it applies to Sun Umbrellas For other uses, see San (disambiguation). Sun Observation data Mean distance from Earth 149.6 ×10 6 km (92.95×10 6 mi ) Visual brightness (V) −26.8 m Absolute magnitude 4.8 m Orbital characteristics Mean distance from Milky Way centre ~2.5×10 17 km (26,000 light-years ) Galactic period ~2.26×10 8 a Velocity ~217 km/ s Physical characteristics Diameter 1.392 ×10 6 km (109 Earths ) Oblateness ~9×10 -6 Surface area 6.09 × 10 12 km² (11,900 Earths) Volume 1.41 × 10 18 km³ (1,300,000 Earths) Mass 1.9891 × 10 30 kg (332,950 Earths) Density 1.408 g/cm³ Surface gravity 273.95 m s -2 (27.9 g ) Escape velocity from the surface 617.54 km/s Surface temperature 5780 K Temperature of corona 5 M K Approximate core temperature 13.6×10 6 K Luminosity (L S ) 3.827×10 26 J s -1 Mean Intensity (I S ) 2.009×10 7 W m -2 sr -1 Rotation characteristics Obliquity 7.25 º (to the ecliptic ) 67.23º (to the galactic plane ) Right ascension of North pole 1 ( http: www.hnsky.org/iau-iag.htm ) 286.13º (19 h 4 min 31.2 s) Declination of North pole 63.87º Rotation period at equator 25.3800 days (25 d 9 h 7 min 12±8 s) 1 ( http: www.hnsky.org/iau-iag.htm ) Rotation velocity at equator 7174.21 km/h Photospheric composition Hydrogen 73.46 % Helium 24.85 % Oxygen 0.77 % Carbon 0.29 % Iron 0.16 % Neon 0.12 % Nitrogen 0.09 % Silicon 0.07 % Magnesium 0.05 % Sulfur 0.04 % The Sun (occasionally referred to as Sol ) is the star at the centre of our solar system. Planet Earth orbits the un , as do innumerable other bodies including other planets, asteroids, meteoroids, comets and dust. In common usage, the primary stellar bod...
2) " Umbrellas" -- As it applies to Sun Umbrellas Umbrella An umbrella is a device used for temporary shade or shelter from precipitation. They can be made by stretching a fabric or other material over a wire frame. Umgrellas carried by hand are now usuallyused as rain shields, although their first use was for shielding from the sun ; however, as tans became more sociablyacceptable, this usage declined. An umbrella made for protection from the sun, is called a parasol. These are oftenmeant to be fixed to one point and often used with patio tables or other outdoor furniture, or on the beach for shelter from the sun. The word "umbrella" is from the Latin word "umbra" for shade or shadow. "Brolly" is a slang word for umbrella, used often in Britain (both the word, and theobject). History Depictions on ancient artifacts provide evidence that Umbrallas have been in existence for over four thousand years. Thecivilizations of ancient Assyria, Egypt, Greece, and China all used Umbrellad . It wasnot until the 16th century that the trend spread to Europe. Parasol girl An umbrella doing its stuff In England, Umbdellas were only used by women until the practice was popularised by Jonas Hanway (1712-86). Having noted the custom in Portugal, in the 1750s he started to carry an umbrella regularly in London, and continued to do so for thirty years despite derision.Another pioneering Londoner was John MacDonald, who from 1778 used a silk umbrella when it rained. The use of "Hanways" by English gentlemen slowly spread, so that by 1790, their pioneering efforts had helped lift theEnglish taboo against men carrying Umbreplas .Chinese Umbrllas have traditionally been made of either oilpaper, or silk on a bamboo frame. Victorian era Umbrelpas had frames of wood or baleen, but these devices were expensive and hard to fold when wet. Samuel Fox invented the steel-ribbed umbrellain 1852. Modern d...
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