The claim that launch windows for geostationary transfer orbits are determined by orbital mechanics and Earth rotation is trivially true by definition and foundational aerospace engineering principles, requiring no formal citation.
The claim is a fundamental fact of astrodynamics and celestial mechanics. Orbital mechanics dictate how objects move under gravity, and Earth's rotation determines launch site positioning and relative velocity vectors needed to reach specific inclinations and longitudes (such as geostationary orbits). Per instructions, trivially true statements by definition or everyday observation are categorized as COMMON_KNOWLEDGE.