Lobachevsky geometry and stellar parallaxes
One aim of this paper is to provide proofs for the formulas and inequalities proposed without the proof by Lobachevsky in his first published paper on the subject of non-Euclidean geometry of 1829. These are obtained by computations in the Beltrami-Poincaré model. The other aim is to highlight the intimate connection between hyperbolic geometry and relativity theory.
scientific article; zbMATH DE number 7596645