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Arcsec2
Arcsec, ArcSec, ARCSEC, or arcsec may refer to: * Arcsecond A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of one degree. Since one degree is of a turn (or complete rotation), one minute of arc is of a turn. The na ..., a unit of angular measurement * Arcsecant, an inverse trigonometric function See also * sec−1 (other) * asec (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcsecond
A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of one degree. Since one degree is of a turn (or complete rotation), one minute of arc is of a turn. The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on a spherical Earth, so the actual Earth circumference is very near . A minute of arc is of a radian. A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol , is of an arcminute, of a degree, of a turn, and (about ) of a radian. These units originated in Babylonian astronomy as sexagesimal subdivisions of the degree; they are used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying, and marksmanship. To express even smaller angles, standard SI prefixes can be employed; the milliarcsecond (mas) and microarcsecond (μas), for instance, are commonly used in astron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcsecant
In mathematics, the inverse trigonometric functions (occasionally also called arcus functions, antitrigonometric functions or cyclometric functions) are the inverse functions of the trigonometric functions (with suitably restricted domains). Specifically, they are the inverses of the sine, cosine, tangent, cotangent, secant, and cosecant functions, and are used to obtain an angle from any of the angle's trigonometric ratios. Inverse trigonometric functions are widely used in engineering, navigation, physics, and geometry. Notation Several notations for the inverse trigonometric functions exist. The most common convention is to name inverse trigonometric functions using an arc- prefix: , , , etc. (This convention is used throughout this article.) This notation arises from the following geometric relationships: when measuring in radians, an angle of ''θ'' radians will correspond to an arc whose length is ''rθ'', where ''r'' is the radius of the circle. Thus in the unit circl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sec-1 (other)
Sec-1, SEC-1, sec-1, or sec−1 may refer to: * sec ''x''−1 = sec(''x'')−1 = exsec(''x'') or exsecant of ''x'', an old trigonometric function * sec−1''y'' = sec−1(''y''), sometimes interpreted as arcsec(''y'') or arcsecant of ''y'', the compositional inverse of the trigonometric function secant (see below for ambiguity) * sec−1''x'' = sec−1(''x''), sometimes interpreted as (sec(''x''))−1 = = cos(''x'') or cosine of ''x'', the multiplicative inverse (or reciprocal) of the trigonometric function secant (see above for ambiguity) * sec ''x''−1, sometimes interpreted as sec(''x''−1) = sec(), the secant of the multiplicative inverse (or reciprocal) of ''x'' (see below for ambiguity) * sec ''x''−1, sometimes interpreted as (sec(''x''))−1 = = cos(''x'') or cosine of ''x'', the multiplicative inverse (or reciprocal) of the trigonometric function secant (see above for ambiguity) See also * Second (time) *Second (angle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
