Functions
auto	geometry (const Planet planet, const double jde_tt) -> astro::illumination::Geometry
	Calculate observer-facing geometry for a planet.

Function Documentation

◆ geometry()

auto astro::planet::observation::geometry	(	const Planet	planet,
		const double	jde_tt )->astro::illumination::Geometry

inlinenodiscard

Calculate observer-facing geometry for a planet.

Parameters

planet	The planet to calculate, from Mercury through Pluto.
jde_tt	The Julian Ephemeris Day based on TT.

Returns: Great-circle separation from the Sun, target-centered phase angle, and illuminated fraction.

Uses the apparent geocentric positions from sun::geocentric_coord::apparent and planet::geocentric_coord::apparent, inheriting their model scope.

Exceptions

std::invalid_argument	If jde_tt is not finite or outside the selected planet's documented domain, or planet is not a named enumerator.
std::runtime_error	If either apparent-position evaluation cannot produce a finite result.