astro::sun::equatorial_coord Namespace Reference

Functions
auto	apparent (const double jde) -> astro::coords::EquatorialCoord
	Calculate the apparent geocentric equatorial coordinates of the Sun.

Function Documentation

apparent()

auto astro::sun::equatorial_coord::apparent ( const double jde ) ->astro::coords::EquatorialCoord

inlinenodiscard

Calculate the apparent geocentric equatorial coordinates of the Sun.

Parameters

jde	The julian ephemeris day number, which is based on TT.

Returns

The apparent right ascension α (normalized to [0°, 360°)) and declination δ.

Composes geocentric_coord::apparent (ecliptic λ, β, with FK5 + nutation + aberration) with the true obliquity ε and Meeus (13.3)–(13.4) via coords::ecliptic_to_equatorial. The result is of-date apparent equatorial place of the Sun, suitable as input to sunrise/sunset hour-angle calculations.

See also

Jean Meeus, "Astronomical Algorithms", Second Edition, Chapters 13 and 25.