> Rarely discussed in popular treatment is anchor distance Yes, and I'm sad that it's so rare. The Megamaser Cosmology Project is incredibly awesome; combinin

> Rarely discussed in popular treatment is anchor distance Yes, and I'm sad that it's so rare. The Megamaser Cosmology Project is incredibly awesome; combining line of sight acceleration, velocity, velocity gradient, and observer angle on the sky is very "anchor". https://safe.nrao.edu/wiki/bin/view/Main/MegamaserCosmologyProject https://safe.nrao.edu/wiki/bin/view/Main/MegamaserCosmologyP... Gaia seems to be making good progress on direct parallax up to kiloparsecs. And always happy to plug ASAS-SN <https://www.astronomy.ohio-state.edu/asassn/index.shtml https://www.astronomy.ohio-state.edu/asassn/index.shtml> (The deleted @SuperASASSN was one of the best astro follows on twitter some years ago), who have found an awful lot of detached eclipsing binaries: <https://academic.oup.com/mnras/article/517/2/2190/6695108?login=false https://academic.oup.com/mnras/article/517/2/2190/6695108?lo...>.