Compilation of measurements of H0 since 2000, based on the historical data assembled by J. Huchra for the NASA-HST Key Project on the Extragalactic Distance Scale. The additional points since 2010 are from Riess et al. (2011, 2016, 2018a,b), Freedman et al. (2012), Rathna Kumar et al. (2015), Bonvin et al. (2017), and Dhawan et al. (2018). Blue circles show “traditional” measures of H0, while cyan and red squares show H0 inferred from fits to CMB data from WMAP (Bennett et al. 2011; Hinshaw et al. 2013) and Planck. The magenta diamond shows the standard siren measurement from Abbott et al. (2017b). Inferences from the inverse distance ladder are discussed in the text and Fig. 22. We note the tremendous increase in precision with time, driven by improvements in methods and in data, and the narrowing of the difference between “high” and ‘’low” values of H0.
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