[aspect-devel] Earth radius in spherical shell models

[Max Rudolph]

I am wondering why the default outer radius of the Earth in ASPECT is set
to 6336 km (based on the default value in Geometry model/Spherical shell)?

6,336 km is the equatorial radius of curvature
6,378 km is the equatorial radius
6,371 km is the radius of a sphere with equal volume

I know that these differ only at the 0.5% level and for most practical
purposes may not make any difference, but was wondering if there is a
justification for defaulting to one over the other?
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