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- % speed of light
- clear(c)$
- % Planck's constant
- clear(h)$
- % elementary charge
- clear(el)$
- % newtonian constant of gravity
- clear(g)$
- % Avogadro's number
- clear(a)$
- % Boltzmann's constant
- clear(b)$
- % mass of electron
- clear(me)$
- % mass of neutron
- clear(mn)$
- % mass of proton
- clear(mp)$
- % dielectric constant
- clear(epsilon0)$
- % permeability coefficient mue_0 = 4*pi*1e-7
- clear(mu0)$
- % Einstein's gravitational constant kappa = 8*pi*G / c^4
- clear(kappa)$
- % radius of universe [m]
- clear(ru)$
- % age of universe [s]
- clear(tu)$
- % critical mass density for a closing universe [cmd]
- clear(cmd)$
- % astronomical unit
- clear(au)$
- % Parsec
- clear(pc)$
- % seconds per sidereal day
- clear(sidd)$
- % days per tropical year
- clear(tropy)$
- % Planck mass
- clear(pm)$
- % Planck time
- clear(pt)$
- off rounded;
- end;
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