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EA:  SUNSET_TIME

Status: STD 2005/06/07
Code: 1366

Concept definition: The <<TIME_OF_DAY>> of sunset. The time of sunset is defined to occur when the geometric zenith distance of the centre of the <SUN> is 90,8333 arc degrees; that is, the centre of the <SUN> is geometrically 50 arc minutes below a horizontal plane for an observer at MSL with a level, unobstructed western horizon under average atmospheric conditions. The upper limb of the <SUN> will then appear to be tangent to the western horizon. The 50 arc minute geometric depression of the centre of the <SUN> used for the computations is obtained by adding the mean apparent <<RADIUS>> of the <SUN> (16 arc minutes) to the mean amount of atmospheric refraction at the horizon (34 arc minutes).
 
Attribute value type: CONSTRAINED_STRING
Reference type: IR
Reference: [SIED]
Supplemental references:  

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