Spat (unit)




The spat (symbol sp[1]), from the Latin spatium ("space"), is a unit of solid angle.[2][3] 1 spat is equal to 4π steradians[1][3] or approximately 7004412530000000000♠41253 square degrees of solid angle.[2] As such, it is the solid angle subtended by a sphere at its center.[2]


The spat (symbol S[4]) is also an obsolete unit of distance used in astronomy.[4][2] It is equal to 7009100000000000000♠1000000000 kilometres (1 Tm or 1012 m).[4][2] It is about 6.6846 astronomical units (AU),[2]6996105700000000000♠1.057×10−4 light-years or 6995324000000000000♠3.240×10−5 parsecs.



See also



  • Turn (geometry) — the 2D counterpart of the spat, equivalent to 2π radians


References





  1. ^ ab The Ultimate Online Reference for Engineers. Sunnyvale, California, USA: eFunda Inc. Retrieved 2015-10-19..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  2. ^ abcdef Rowlett, Russ (2004). "A Dictionary of Units of Measurement". Chapel Hill: University of North Carolina. Retrieved 2015-10-16.


  3. ^ ab Glossary » Units » Solid Angle » Spat. Sunnyvale, California, USA: eFunda Inc.


  4. ^ abc Nouvelle encyclopédie du monde. 16. Montréal, Toronto, Paris: Éditions Leland Ltée, Librairie Aristide Quillet. 1962. p. 5426.









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