a metric system can be based on readily measurable cosmic constants; albeit there may be complex-related co-systems |

We consider the most accurately known/knowable universal constants:

1. Cosmic constants, measured in our solar-system Earth-space near-vacuum space-aether

2. Separated by established theory (primary) versus taxonomic measurements (secondary)

3. All dependent on the cosmic eonic era: cosmos size, density, nearby masses, fields

4. Discovered equalities in theories (often asymptotic)

5. Basic mathematical constants, relating dimensions

6. Identified co-systems where dimensions are not simply related by the other constants

Primarity is almost variable itself: depending on what is known/knowable. For example, the speed of light is deemed constant over the frequency spectrum; but these are photons from electrons of known mass ... already we know light-speed varies through gravitational fields, even along a centerline,- and, how-much gravitational mass is in our cosmos, affects the speed of light; and local galactic density further adjusts that;-- but measurements taken, inside, may-so compensate the measurement-process (while thereby misjusting the speed of light across the cosmos outside our galaxy, probably a tiny amount too small to count, yet thereby a secondary effect on a primary constant)-... does a muon-emitted photon run the same speed? or a doubly-charged-[parton]-emitted photon (eg. helon-anti-helon co-orbit emission)? The mere fact, while unknown in measure, that the halves of a photon -transversal wave- stay together over cosmic distances, means there is some co-munication, suggestive of ordinary transversal wave process: therefor shallower "longer" waves, more compressive longitudinal speeds, may, be, faster: traveling straighter ... it may be in the photon wings' longer waves.

- speed of light relates distance and time:
- c = 299792458 m/s (now deemed exact in SI Metric)
- used squared in the mass-energy equation, E = m c
^{2} - rechoose distance or time: c = 1@9 else √1@17 distanceunit/timeunit
- electron relates mass, energy, electron-voltage; distance, time:
- m
_{e}= 9.109383@-31 kg (kilogram mass) - m
_{e}= 8.187105@-14 J (Joule energy) - m
_{e}= 0.51099892 MeV (electron-volt) - rechoose mass: 1@18 else 1@17 energyunit/massunit
- rechoose electron-volt: 1@18 else 1@17 electron-voltunit/energyunit
- charge of an electron relates distance, force (time), cosmic-loading resonance
- q
_{e}= - impedance of a vacuum relates electric and magnetic:
- Z
_{0}= 376.730313461 Ω - rechoose magnetic: 1 voltageunit/currentunit

- gravity relates distance, time, mass:

- minimum attenuation in a coaxial cable, Z = 77. Ω (CF Z
_{0}/2√6) - maximum power capacity in a coaxial cable, Z = 30. Ω (cf Z
_{0}/4π)

- linear unit, 1
- circular unit, pi
- relates linear and polar
- entropic unit, e
- relates combinatorics, usually in higher order terms
- integers, n = 2,3,4,5, etc.
- relates multiples
- roots,
^{n}√x - relates integral sub-powers
- reciprocals
- relates multiplicative sub-factors

- G = 4π
^{2}R^{3}/ M T^{2}= a R^{2}/ M = V^{2}R / M = 6.672(59)@-11 m^{3}/s^{2}kg gravity - h = Mlc = 6.62607(55)@-34 m
^{2}kg/s photon - Q = qe
^{2}/ Me^{2}4π ε_{0}= qe^{2}μ_{0}c^{2}/ Me^{2}4π = 2.780251(01)@32 m^{3}/s^{2}kg charge - ℎ = h/2π = 1.054572(67)@-34 m
^{2}kg/s photon - qe = 1.602177(33)@-19 C
- Me = 9.10938(97)@-31 kg
- me a = Fe = qe(qe / 4π ε
_{0}r^{2}) = ε_{0}= 1 / μ_{0}c^{2} - μ
_{0}= 4π @-7 N s^{2}/ c^{2}

Just a few basic constants are needed, to specify all the dimensions of length and time ... even mass and temperature and electronic charge eventually are derivable from just a few basic constants. .... the major constraint being general usability - the major improvement being cosmic constancy (and the search for extra-terrestrial intelligent civilizations).

REF: values from physics.nist.gov (NIST Reference on Constants, Units, Uncertainty) CODATA

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