#include <Epoch.hpp>

Public Member Functions
	Epoch ()
	Default constructor (J2000.0 epoch).
	Epoch (const Scalar &tai_seconds, int delta_at=37)
	Construct from TAI seconds since J2000.0.
Scalar	jd_tai () const
	Get Julian Date in TAI scale.
Scalar	jd_tt () const
	Get Julian Date in TT scale.
Scalar	jd_gps () const
	Get Julian Date in GPS scale.
Scalar	jd_utc () const
	Get Julian Date in UTC scale (using stored delta_at).
Scalar	jd_tdb () const
	Get Julian Date in TDB scale.
Scalar	mjd_tt () const
	Get Modified Julian Date in TT scale.
const Scalar &	tai_seconds () const
	Get TAI seconds since J2000.0.
Scalar	tt_seconds () const
	Get TT seconds since J2000.0.
Scalar	centuries_tt () const
	Get Julian centuries since J2000.0 in TT scale.
int	gps_week () const
	Get GPS week number.
Scalar	gps_seconds_of_week () const
	Get seconds within the GPS week.
int	delta_at () const
	Get the stored TAI - UTC offset.
void	set_delta_at (int delta_at)
	Set the TAI - UTC offset.
Epoch	operator+ (const Scalar &seconds) const
	Add duration in seconds.
Epoch	operator- (const Scalar &seconds) const
	Subtract duration in seconds.
Scalar	operator- (const Epoch &other) const
	Time difference in seconds.
Epoch &	operator+= (const Scalar &seconds)
	Add duration in seconds (in-place).
Epoch &	operator-= (const Scalar &seconds)
	Subtract duration in seconds (in-place).
std::string	to_iso_string () const
	Convert to ISO 8601 string in UTC.
std::tuple< int, int, int, int, int, double >	to_utc_calendar () const
	Convert to calendar components in UTC.

Static Public Member Functions
static Epoch	from_tai_seconds (const Scalar &tai_sec, int delta_at=37)
	Create Epoch from TAI seconds since J2000.0.
static Epoch	from_jd_tai (const Scalar &jd_tai, int delta_at=37)
	Create Epoch from TAI Julian Date.
static Epoch	from_jd_tt (const Scalar &jd_tt, int delta_at=37)
	Create Epoch from TT Julian Date.
static Epoch	from_jd_gps (const Scalar &jd_gps, int delta_at=37)
	Create Epoch from GPS Julian Date.
static Epoch	from_utc (int year, int month, int day, int hour=0, int min=0, double sec=0.0)
	Create Epoch from UTC calendar (numeric only).
static Epoch	from_gps_week (int week, const Scalar &seconds_of_week, int delta_at=37)
	Create Epoch from GPS week and seconds.

Constructor & Destructor Documentation

◆ Epoch() [1/2]

template<typename Scalar>

vulcan::time::Epoch< Scalar >::Epoch ( )

inline

Default constructor (J2000.0 epoch).

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ Epoch() [2/2]

template<typename Scalar>

vulcan::time::Epoch< Scalar >::Epoch	(	const Scalar &	tai_seconds,
		int	delta_at = 37 )

inlineexplicit

Construct from TAI seconds since J2000.0.

Parameters

tai_seconds	TAI seconds since J2000.0 TT
delta_at	TAI - UTC offset for this epoch (default: 37 for post-2017)

Member Function Documentation

◆ centuries_tt()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::centuries_tt ( ) const

inlinenodiscard

Get Julian centuries since J2000.0 in TT scale.

Commonly used for precession/nutation models.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ delta_at()

template<typename Scalar>

int vulcan::time::Epoch< Scalar >::delta_at ( ) const

inlinenodiscard

Get the stored TAI - UTC offset.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ from_gps_week()

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::from_gps_week	(	int	week,
		const Scalar &	seconds_of_week,
		int	delta_at = 37 )

inlinestatic

Create Epoch from GPS week and seconds.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ from_jd_gps()

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::from_jd_gps	(	const Scalar &	jd_gps,
		int	delta_at = 37 )

inlinestatic

Create Epoch from GPS Julian Date.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ from_jd_tai()

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::from_jd_tai	(	const Scalar &	jd_tai,
		int	delta_at = 37 )

inlinestatic

Create Epoch from TAI Julian Date.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ from_jd_tt()

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::from_jd_tt	(	const Scalar &	jd_tt,
		int	delta_at = 37 )

inlinestatic

Create Epoch from TT Julian Date.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ from_tai_seconds()

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::from_tai_seconds	(	const Scalar &	tai_sec,
		int	delta_at = 37 )

inlinestatic

Create Epoch from TAI seconds since J2000.0.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ from_utc()

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::from_utc	(	int	year,
		int	month,
		int	day,
		int	hour = 0,
		int	min = 0,
		double	sec = 0.0 )

inlinestatic

Create Epoch from UTC calendar (numeric only).

Note: This is numeric-only because calendar parsing is an I/O operation. For symbolic mode, create from numeric calendar then add symbolic duration.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ gps_seconds_of_week()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::gps_seconds_of_week ( ) const

inlinenodiscard

Get seconds within the GPS week.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ gps_week()

template<typename Scalar>

int vulcan::time::Epoch< Scalar >::gps_week ( ) const

inlinenodiscard

Get GPS week number.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ jd_gps()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::jd_gps ( ) const

inlinenodiscard

Get Julian Date in GPS scale.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ jd_tai()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::jd_tai ( ) const

inlinenodiscard

Get Julian Date in TAI scale.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ jd_tdb()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::jd_tdb ( ) const

inlinenodiscard

Get Julian Date in TDB scale.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ jd_tt()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::jd_tt ( ) const

inlinenodiscard

Get Julian Date in TT scale.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ jd_utc()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::jd_utc ( ) const

inlinenodiscard

Get Julian Date in UTC scale (using stored delta_at).

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ mjd_tt()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::mjd_tt ( ) const

inlinenodiscard

Get Modified Julian Date in TT scale.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ operator+()

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::operator+ ( const Scalar & seconds ) const

inline

Add duration in seconds.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ operator+=()

template<typename Scalar>

Epoch & vulcan::time::Epoch< Scalar >::operator+= ( const Scalar & seconds )

inline

Add duration in seconds (in-place).

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ operator-() [1/2]

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::operator- ( const Epoch< Scalar > & other ) const

inline

Time difference in seconds.

◆ operator-() [2/2]

template<typename Scalar>

Epoch vulcan::time::Epoch< Scalar >::operator- ( const Scalar & seconds ) const

inline

Subtract duration in seconds.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ operator-=()

template<typename Scalar>

Epoch & vulcan::time::Epoch< Scalar >::operator-= ( const Scalar & seconds )

inline

Subtract duration in seconds (in-place).

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ set_delta_at()

template<typename Scalar>

void vulcan::time::Epoch< Scalar >::set_delta_at ( int delta_at )

inline

Set the TAI - UTC offset.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ tai_seconds()

template<typename Scalar>

const Scalar & vulcan::time::Epoch< Scalar >::tai_seconds ( ) const

inlinenodiscard

Get TAI seconds since J2000.0.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ to_iso_string()

template<typename Scalar>

std::string vulcan::time::Epoch< Scalar >::to_iso_string ( ) const

inlinenodiscard

Convert to ISO 8601 string in UTC.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ to_utc_calendar()

template<typename Scalar>

std::tuple< int, int, int, int, int, double > vulcan::time::Epoch< Scalar >::to_utc_calendar ( ) const

inlinenodiscard

Convert to calendar components in UTC.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

◆ tt_seconds()

template<typename Scalar>

Scalar vulcan::time::Epoch< Scalar >::tt_seconds ( ) const

inlinenodiscard

Get TT seconds since J2000.0.

Examples: /home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

The documentation for this class was generated from the following file:

include/vulcan/time/Epoch.hpp

Public Member Functions

Static Public Member Functions

Constructor & Destructor Documentation

◆ Epoch() [1/2]

◆ Epoch() [2/2]

Member Function Documentation

◆ centuries_tt()

◆ delta_at()

◆ from_gps_week()

◆ from_jd_gps()

◆ from_jd_tai()

◆ from_jd_tt()

◆ from_tai_seconds()

◆ from_utc()

◆ gps_seconds_of_week()

◆ gps_week()

◆ jd_gps()

◆ jd_tai()

◆ jd_tdb()

◆ jd_tt()

◆ jd_utc()

◆ mjd_tt()

◆ operator+()

◆ operator+=()

◆ operator-() [1/2]

◆ operator-() [2/2]

◆ operator-=()

◆ set_delta_at()

◆ tai_seconds()

◆ to_iso_string()

◆ to_utc_calendar()

◆ tt_seconds()