cio_locator_s
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Defined in: cip.rs:115
fn cio_locator_s(t: f64, x: super::Rad, y: super::Rad) -> super::Rad
Evaluate the CIO locator s(t) at TT Julian centuries t, given
the CIP coordinates (x, y) at the same instant.
TN36 Table 5.2d tabulates s + X·Y/2 as a polynomial plus a
trigonometric series; this function evaluates that combined quantity
and subtracts X·Y/2 to isolate s. Equivalent to ERFA’s s06.
Passing x and y from a different source than cip_xy is
permitted: the CIO locator depends only on the CIP position in the
GCRS and the epoch, so mixing model versions is meaningful and
occasionally useful (e.g. applying observed EOP dX, dY
corrections before computing s).