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We introduce the the Triangular Ring (TR) resonator. We show that thedifference between the clockwise and anti-clockwise resonant frequencies of avacuum TR resonator is sensitive to the birefringence parity-odd parameters ofthe photon's sector of the minimal Standard Model Extension (mSME): theStandard Model plus all the perturbative parameters encoding the break theLorentz symmetry. We report that utilizing the current technology allows fordirect measurement of these parameters with a sensitivity of the parity evenones and improves the best current resonator bounds by couple of orders ofmagnitudes.  We note that designing an optical table that rotates perpendicular to thegravitational equipotential surface (geoid) allows for direct measurement ofthe constancy of the light speed at the vicinity of the earth in all directionsin particular perpendicular to the geoid. If this table could achieve theprecision of the ordinary tables, then it would improve the GPS bounds on theconstancy of the light speed perpendicular to geoid by about eight orders ofmagnitude.

Triangular Ring Resonator: Direct measurement of the parity-odd parameters of the photon sector of SME