astro::lunar_node Namespace Reference

Namespaces
namespace	detail

Enumerations
enum class	Node : uint8_t { MEAN_ASCENDING , MEAN_DESCENDING , TRUE_ASCENDING , TRUE_DESCENDING }
	Mean or true lunar nodes. More...

Functions
auto	position (const Node node, const double jde_tt) -> toolbox::AngleDeg
	Calculate a mean or true lunar-node longitude.

Variables
constexpr double	START_JDE_TT
	Inclusive start of the lunar-node position models, in JDE(TT).
constexpr double	END_JDE_TT
	Exclusive end of the lunar-node position models, in JDE(TT).

Enumeration Type Documentation

Node

enum class astro::lunar_node::Node : uint8_t

strong

Mean or true lunar nodes.

Note

True nodes use Meeus' five-term approximation.

Enumerator
MEAN_ASCENDING
MEAN_DESCENDING
TRUE_ASCENDING
TRUE_DESCENDING

Function Documentation

position()

auto astro::lunar_node::position ( const Node node, const double jde_tt )->toolbox::AngleDeg

inlinenodiscard

Calculate a mean or true lunar-node longitude.

Parameters

node	The lunar-node variant.
jde_tt	Julian Ephemeris Day (TT), in [2409542.5, 2488069.5).

Returns

Tropical longitude in the true ecliptic and equinox of date, normalized to [0°, 360°).

Exceptions

std::invalid_argument

If node is unknown or jde_tt is non-finite or outside the domain.

Note

Uses Meeus' mean-node formula or five-term true-node approximation, plus full IAU 1980 longitude nutation. Descending nodes are exact antipodes; latitude is zero, with no physical distance.

The project-selected domain matches Pluto's raw domain; Meeus gives no accuracy interval.

See also

Jean Meeus, "Astronomical Algorithms", Second Edition, Equation (47.7) and printed p. 344.

astro::earth::nutation::longitude

Variable Documentation

END_JDE_TT

double astro::lunar_node::END_JDE_TT

inlineconstexpr

Exclusive end of the lunar-node position models, in JDE(TT).

START_JDE_TT

double astro::lunar_node::START_JDE_TT

inlineconstexpr

Inclusive start of the lunar-node position models, in JDE(TT).