Earth Orientation Parameters (EOP), for defining the unmodelled (via the IAU 2000 / 2006 precession-nutation models) polar motion and rotational variations of the physical Earth. More...

Classes
class	supernovas::EOP
	Mean (interpolated) IERS Earth Orientation Parameters (EOP), without diurnal variations. More...

Typedefs
typedef int(*	novas_nutation_provider) (double jd_tt_high, double jd_tt_low, double restrict dpsi, double restrict deps)
	Function type definition for the IAU 2000 nutation series calculation.

Functions
novas_nutation_provider	get_nutation_lp_provider ()
	Returns the function configured for low-precision IAU 2000 nutation calculations instead of the default nu2000k().
int	set_nutation_lp_provider (novas_nutation_provider func)
	Set the function to use for low-precision IAU 2000 nutation calculations instead of the default nu2000k().

Detailed Description

Earth Orientation Parameters (EOP), for defining the unmodelled (via the IAU 2000 / 2006 precession-nutation models) polar motion and rotational variations of the physical Earth.

EOP are necessary to transform between pseudo Earth-fixed (e.g. the Terrestrial Intermediate Reference System [TIRS]) and the Earth-fixed International Terrestrial Reference System (ITRS). They are essential for precise calculations for Earth-based observers.

IERS publishes daily Earth orientation data, in various ITRF realizations. For the utmost accuracy (below the mas-level), these must be further corrected for diurnal variations caused by librarion and the oceans tides, which is something that SuperNOVAS does automatically when defining astrometric time or an observing frame with the interpolated published EOP values.

Typedef Documentation

◆ novas_nutation_provider

typedef int(* novas_nutation_provider) (double jd_tt_high, double jd_tt_low, double *restrict dpsi, double *restrict deps)

Function type definition for the IAU 2000 nutation series calculation.

Parameters

	jd_tt_high	[day] High-order part of the Terrestrial Time (TT) based Julian date. Typically it may be the integer part of a split date for the highest precision, or the full date for normal (reduced) precision.
	jd_tt_low	[day] Low-order part of the Terrestrial Time (TT) based Julian date. Typically it may be the fractional part of a split date for the highest precision, or 0.0 for normal (reduced) precision.
[out]	dpsi	[rad] δψ Nutation (luni-solar + planetary) in longitude, in radians.
[out]	deps	[rad] δε Nutation (luni-solar + planetary) in obliquity, in radians.

Returns: 0 if successful, or else -1 (errno should be set to indicate the type of error).

See also: nutation(), nutation_angles(), iau2000a(), iau2000b(), iau2000k()

Author: Attila Kovacs

Since: 1.0

Function Documentation

◆ get_nutation_lp_provider()

novas_nutation_provider get_nutation_lp_provider ( )

Returns the function configured for low-precision IAU 2000 nutation calculations instead of the default nu2000k().

Returns: the function to use for low-precision IAU 2000 nutation calculations

Since: 1.3

Author: Attila Kovacs

See also: set_nutation_lp_provider(), nutation_angles(), nutation()

Referenced by nutation_angles().

◆ set_nutation_lp_provider()

int set_nutation_lp_provider ( novas_nutation_provider func )

Set the function to use for low-precision IAU 2000 nutation calculations instead of the default nu2000k().