For those seeking professional resources on Mission Geometry, Orbit, and Constellation Design and Management
: Deep dive into geometry on the celestial sphere and full-sky spherical geometry.
For a comprehensive understanding of mission geometry and satellite constellation design, the primary "best" resource is widely considered to be James R. Wertz's foundational textbook:
Mission Geometry: Orbit and Constellation Design and Management This work is often paired with the broader Space Mission Analysis and Design (SMAD)