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[knn] placeholder for planning session
author Jeff Hammel <k0scist@gmail.com>
date Sun, 17 Sep 2017 14:35:50 -0700
parents 5dba84370182
children
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"""
physical constants
"""

# The Earth isn't a sphere, but let's pretend it is
# https://en.wikipedia.org/wiki/Earth_radius
Rearth = 6371.  # km
diameter = 2.*Rearth