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The $^1\mathrm{S}_0$-$^3\mathrm{P}_0$ clock transition frequency$\nu_\text{Sr}$ in neutral $^{87}$Sr has been measured relative to the Csstandard by three independent laboratories in Boulder, Paris, and Tokyo overthe last three years. The agreement on the $1\times 10^{-15}$ level makes$\nu_\text{Sr}$ the best agreed-upon optical atomic frequency. We combineperiodic variations in the $^{87}$Sr clock frequency with $^{199}$Hg$^+$ andH-maser data to test Local Position Invariance by obtaining the strongestlimits to date on gravitational-coupling coefficients for the fine-structureconstant $\alpha$, electron-proton mass ratio $\mu$ and light quark mass.Furthermore, after $^{199}$Hg$^+$, $^{171}$Yb$^+$ and H, we add $^{87}$Sr asthe fourth optical atomic clock species to enhance constraints on yearly driftsof $\alpha$ and $\mu$.

New Limits on Coupling of Fundamental Constants to Gravity Using $^{87}$Sr Optical Lattice Clocks