The art of building a smooth cosmic distance ladder in a perturbed universe

Abstract How does a smooth cosmic distance ladder emerge from observations made single location in lumpy Universe? Distances to the Type Ia supernova (SN1A) Hubble flow are anchored on local measurements sources that very nearby. We described how this configuration could be built perturbed universe where lumpiness is as small perturbations top of flat Friedmann-Lemaıtre Robertson-Walker (FLRW) spacetime. show there non-negligible modification (about 11%) background FLRW area due presence inhomogeneities immediate neighbourhood an observer. find sourced by electric part Weyl tensor indicating tidal deformation spacetime detail it impact calibration SN1A absolute magnitude flow. potentially resolve and tensions simultaneously without need for early or late dark energy.