Struct TCG 

pub struct TCG;

Geocentric Coordinate Time — the coordinate time for the GCRS.

TCG is the proper time experienced by a clock at the geocenter, free from the gravitational time dilation of the Earth’s potential.

The defining relation (IAU 2000 Resolution B1.9) is:

dTT / dTCG = 1 − L_G

where L_G = 6.969 290 134 × 10⁻¹⁰ is an IAU defining constant. Integrating:

TT = TCG − L_G × (JD_TCG − T₀)

with T₀ = 2 443 144.500 372 5 (JD of 1977 January 1.0 TAI in the TCG scale).

References

• IAU 2000 Resolution B1.9
• IERS Conventions (2010), §1.2

Trait Implementations

impl Clone for TCG

fn clone(&self) -> TCG

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TCG

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for TCG

fn eq(&self, other: &TCG) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for TCG

fn partial_cmp(&self, other: &TCG) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl TimeScale for TCG

const LABEL: &'static str = "TCG"

Display label used by Time formatting.

fn to_jd_tt(tcg_value: Days) -> Days

Convert a quantity in this scale’s native unit to an absolute JD(TT).

fn from_jd_tt(jd_tt: Days) -> Days

Convert an absolute JD(TT) back to this scale’s native quantity.

impl Copy for TCG

impl StructuralPartialEq for TCG