2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/115157We consider the analog of visibility problems in hyperbolic plane (represented by Poincaré half-plane model H), replacing the standard lattice $Z\times Z$ by the orbit $z=i$ under the full modular group $z$. We prove a visibility criterion and study orchard problem and the cardinality of visible points in large circles14 pages, 1 figureNumber TheoryMetric Geometry51M09, 11H99, 11F06text