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[docs] sigma = 5.670400e-5 # erg cm^-2 s^-1 K^-4 (stefan-boltzman constant in ) [docs] Lsun = 3.839e33 # erg s^-1 [docs] Rsun = 0.004652 # AU [docs] Msun = 1.98892e30 # kg [docs] gsun = 2.740e4 # cm s^-2 surface gravity [docs] G = 6.6726e-8 # gravitational constant cm^3 g^-1 s^-2 [docs] c = 299792.458 # speed of light in km/s [docs] cm_in_AU = 149.60e11 # cm [docs] cm_in_pc = 3.086e18 # cm [docs] AU_in_pc = 206264.806 [docs] sec_in_yr = 3.1557e7