eclipticus æquator caeli pars borealis Bibliotheca — the Library — α maintainer β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ — integratorsthey ship what we make regulators — — half-a-billion users — partners Constellatio Bibliothecae · viginti stellae after Hevelius — drawn at Prague, October MMXXVI PL. I·c · DECL. +50° · R.A. 18ʰ · n=20 N S E W