Constants in cgs

kcgs = 1.38*10^-16; (* Boltzman *)

kev  = 8.617386*10^-5; (*ev/K*);

hcgs = 6.63*10^-34*10^7; (*Plank*)

mecgs = 9.1*10^-28;  (*Electron mass *)

mpcgs = 1.67*10^-24; (* Proton mass *)

Gcgs = 6.67*10^-8; (* Grav const *)

ecgs = 4.8*10^-10; (* charge *)

Rcgs = 8.31*10^7;

Sigmacgs = 5.67*10^-5;  (* Stefan-Boltzmann Flux = ((σT)^4)*)

acgs = 7.57*10^-15;  (* Radiative constant (Subscript[u, ph]) = a*(T^4) *)

evcgs = 1.602*10^-12; (* electronvolt to ergs *)

ccgs = 3*10^10;

Lscgs = 3.8*10^33; (* Luminosity of the Sun *)

Tscgs = 5777;  (* Effective temperature of the Sun *)

Mscgs = 1.99*10^33;  (* Mass of the Sun *)

Rscgs = 6.96*10^10;  (* Radius of the Sun *)

pccgs = 3.086*10^18; (* parsec to cm *)

NAcgs = 6.02*10^23; (* Avogadro *)

Jycgs = 10^-23;  (* Jansky erg/Hz/(cm^2)/s *)

Mmcgs = 6.42*10^26; (* Moon mass *)

Rmcgs = 3376*10^5; (* Moon radius *)

Recgs = 6.37*10^8; (* Earth Radius *)

Mecgs = 5.97*10^27; (* Earth mass *)

Yearcgs = 31556926;  (* Year in seconds *)

MHcgs = 1.0079*1.673*10^-24; (* Hydrogen mass *)

Aucgs = 149598*10^8; (* 1 AU in cm *)

AbsMs = 4.75; (* Bolometric abs mag of the sun *)

ArcSc = (1/3600)*(Pi/180); (* radian *);

ThomsonCrX = 6.65*10^-25; (* Thomson CrosX *)

TCMB = 2.725;

Constants in SI

ksi = 1.38*10^-23;

kev  = 8.617386*10^-5; (*ev/K*);

csi = 3*10^8;

mesi = 9.1*10^-31;

hsi = 6.63*10^-34;

esi = 1.6*10^-19 ; (*Coulombs, or A*s *)

e0 = 8.85*10^-12 ;   (* Vacuum permittivity  A*(s/(v*m)) *)

Lssi = 3.839*10^26; (* W or J/s *)

ergsi = 10^-7; (* 1 erg = (10^(-7)) J *)

ergev = 6.2415*10^11; (* 1 erg = ergev eV *)

Ausi = 149.6*10^9; (* m *)

Aupc = 4.8481*10^-6; (* 1 Au = Aupc pc *)

Auly = 15.813*10^-6; (* 1 Au = Auly light years *)

ster = 4.25*10^10;  (*1 ster in (arcsec^2) *)