Struct TCB 

pub struct TCB;

Barycentric Coordinate Time — the coordinate time for the BCRS.

TCB is the time coordinate complementary to barycentric spatial coordinates. It relates to TDB via a linear drift:

TDB = TCB − L_B × (JD_TCB − T₀) + TDB₀

where:

• L_B = 1.550 519 768 × 10⁻⁸ (IAU 2006 Resolution B3, defining constant)
• TDB₀ = −6.55 × 10⁻⁵ s (IAU 2006 Resolution B3)
• T₀ = 2 443 144.500 372 5 (JD of 1977 January 1.0 TAI)

Since TDB ≈ TT for route-through-JD(TT) purposes (the ≈1.7 ms periodic difference is handled separately), we use the TDB relation directly.

References

• IAU 2006 Resolution B3
• IERS Conventions (2010), §1.2

Trait Implementations

impl Clone for TCB

fn clone(&self) -> TCB

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TCB

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

Formats the value using the given formatter.

impl PartialEq for TCB

fn eq(&self, other: &TCB) -> 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 TCB

fn partial_cmp(&self, other: &TCB) -> 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 TCB

const LABEL: &'static str = "TCB"

Display label used by Time formatting.

fn to_jd_tt(tcb_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 TCB

impl StructuralPartialEq for TCB