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1992-03-24
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376b
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18 lines
; equations for planet design
; used by Jerry Pournelle for science fiction books
; i illuminence, L luminosity, R distance to earth,
; M stellar mass, P period, all relative to sol/earth
; basic equations
i = L / R^2
M P^2 = R^3
; values for a particular story
i = 0.97
L = 0.93
M = 1.2
; exclude extreme values of P, R
1e-10 < P < 1e10
1e-10 < R < 1e10