julian_day.hpp File Reference

#include <array>
#include <cassert>
#include <chrono>
#include <cmath>
#include <cstdint>
#include <format>
#include <limits>
#include <stdexcept>
#include "delta_t.hpp"
#include "leap_second.hpp"
#include "ymd.hpp"
#include "datetime.hpp"

Classes
struct	astro::julian_day::Times
	Modelled UT1 and TT at the same instant, in Julian days. More...

Namespaces
namespace	astro
namespace	astro::julian_day

Enumerations
enum class	astro::julian_day::Scale : uint8_t { astro::julian_day::UTC , astro::julian_day::UT1 }
	The explicitly declared scale of a civil datetime. More...

Functions
auto	astro::julian_day::ut1_to_jd (const calendar::Datetime &ut1_dt) -> double
	Convert UT1 datetime to julian day number.
auto	astro::julian_day::jd_to_ut1 (const double jd) -> calendar::Datetime
	Convert julian day number to UT1 datetime.
auto	astro::julian_day::tt_to_jde (const calendar::Datetime &tt_dt) -> double
	Converts a TT datetime to julian ephemeris day number.
auto	astro::julian_day::jde_to_tt (const double jde) -> calendar::Datetime
	Converts a julian ephemeris day number to TT datetime.
auto	astro::julian_day::civil_to_tt (const calendar::Datetime &civil_dt, const Scale scale, const astro::delta_t::Model model=astro::delta_t::DEFAULT_MODEL) -> calendar::Datetime
	Convert one explicitly scaled civil datetime to TT, with strict modern UTC admission.
auto	astro::julian_day::resolve_times (const calendar::Datetime &civil_dt, const Scale scale, const astro::delta_t::Model model=astro::delta_t::DEFAULT_MODEL) -> Times
	Resolve UT1 and TT without additional civil-year or derived-TT admission policy.
auto	astro::julian_day::jde_to_ut1 (const double jde) -> calendar::Datetime
	Converts a julian ephemeris day number to UT1 datetime.
auto	astro::julian_day::ut1_to_jde (const calendar::Datetime &ut1_dt) -> double
	Converts a UT1 datetime to julian ephemeris day number.
auto	astro::julian_day::jde_to_utc (const double jde) -> calendar::Datetime
	Converts a julian ephemeris day number to UTC datetime.
auto	astro::julian_day::utc_to_jde (const calendar::Datetime &utc_dt) -> double
	Converts a UTC datetime to julian ephemeris day number.
auto	astro::julian_day::utc_year_start_jde (const std::chrono::year year) -> double
	Return the JDE(TT) of January 1 at 00:00 UTC in a calendar year.
auto	astro::julian_day::validate_annual_year (const int32_t year) -> void
	Validate a Gregorian year for an annual (whole-year) query.
auto	astro::julian_day::utc_year_jde_window (const int32_t year) -> std::array< double, 2 >
	Return the half-open UTC year window expressed as JDE(TT) bounds.
constexpr auto	astro::julian_day::jde_to_jm (const double jde) -> double
	Converts a julian ephemeris day number to julian millennium.
constexpr auto	astro::julian_day::jm_to_jde (const double jm) -> double
	Converts a julian millennium to julian ephemeris day number.
constexpr auto	astro::julian_day::jde_to_jc (const double jde) -> double
	Converts a julian ephemeris day number to julian century.
constexpr auto	astro::julian_day::jc_to_jde (const double jc) -> double
	Converts a julian century to julian ephemeris day number.

Variables
constexpr double	astro::julian_day::J2000
	The julian day number of 2000-01-01, 12:00:00.0 (noon).
constexpr double	astro::julian_day::DAYS_PER_JULIAN_CENTURY
	The number of days in one Julian century (36525 days).