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Appendix B ______________________________________________________ Calculation Formulas
VAISALA ______________________________________________________________________ 283
Calculation of Zenith Angle e
ω
δ
δ
coscos)cos(sin)(arccos(sin ⋅⋅+⋅= LatLate
where
Lon = Station longitude
Lat = Station latitude
π
δ
180
))2sin(000908.0
)2cos(006758.0
sin070257.0
cos399912.0
006918.0(
⋅⋅+
⋅−
⋅+
⋅−
=
A
A
A
A
15)0.12( ⋅−=
TST
ω
365
1
360
−
⋅=
DN
A
60
EQ
LMTTST +=
60
4
⋅+= LonGMTLMT
TSCTGMT −=
)2sin(3619.9
)2cos(3495.3
sin3515.7
cos4281.0
0172.0
A
A
A
A
EQ
⋅−
⋅−
⋅−
⋅+
=
where
δ
= Declination (-24.0 ... 24.0 degrees)
ω
= Hour Angle (-180.0 ... 180.0 degrees)
TST = True Solar Time (in decimals)
LMT = Local Mean Time (in decimals)
GMT = Greenwich Mean Time (in decimals)
CT = Civil Time (in decimals)
TS = Time Shift