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WGS84 Earth #34

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DanDeepPhase opened this issue Jul 24, 2023 · 1 comment

DanDeepPhase commented Jul 24, 2023

WGS84 is a standard with a few extra decimals on the earth radius. Is IAU 2015 a preferred standard in some areas? Most of my math requires WGS84.
https://en.wikipedia.org/wiki/World_Geodetic_System#WGS_84

Would it be ok to update these values?

UnitfulAstro.jl/src/UnitfulAstro.jl

Lines 63 to 65 in 030783b

    
           # PLANETARY CONVERSION CONSTANTS (IAU 2015) 
        
           @unit Rearth_e   "R⊕ₑ"      EarthEquatorialRadius     6.3781e6*m                false 
        
           @unit Rearth_p   "R⊕ₚ"      EarthPolarRadius          6.3568e6*m                false

WGS84 semi-major (Earth equatorial radius)= 6378137.0 m
WGS84 semi-minor (Earth polar radius) = 6356752.3 m

Author

DanDeepPhase commented Jul 24, 2023

or more precisely: Rearth_p = Rearth_e * (1 - 1/298.257223563)

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