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PHYSICAL AND ASTRONOMICAL CONSTANTSVelocity of lightGravitational constantPlanck's constantElectron charge

Mass of electronBoltzmann constantAvogadro's numberRydberg constant

Proton mass

Thompson cross-sectionStefan-Boltzmann constant

cG =h =e

=mek =N =Roo =

=

=81rT~/3 =U =

2.998 x 1010 cm s-I6.673 x 10-8 dyne cm-:-2 -26.626 X 10-27 erg s4.803 X 10-10 esu1.602 X 10-19 coulomb9.110 x 10-28 g1.381 X 10-16 erg K-l6.022 X 1023 mole-l211"2mee4/ ch31.097 X 105 cm-l1.673 x 10-24 g1.007 amu6.652 X 10-25 cm-25.670 X 10-5 erg cm-2 K-4 S-1

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1.989x 1033 gm6.960x 1010 cm3.826x 1033 erg s-15.976x 1027 gm6.378 X 103 km9.807x 102 cm s-21.496x 1013 cm3.262 light years3.086x 1018 cm9.461x 1017 cm(1/411") X 106 photons/cm2/s/sr10-26 watts/m2/Hz3.283 X 103 deg2

1.182 X 107 arcmin2

= 4.255 X 1010 arcsec21.745 X 10-2 radian2.909 X 10-4 radian4.848 X 10-6 radian3.046 X 10-4 steradian8.462 X 10-8 steradian2.350 X 10-11 steradian

=

degreearcminarcsecdeg2

arcmin2

arcsec2

light year lyrRayleigh RyJansky ~steradian sr

Solar mass M0Solar radius R0Solar luminosity L0Earth mass MEjlEarth equatorial radius REjlGravity at earth's surface gEjl

• Astronomical unit AUparsec pc