Module time 

Time scales and the public time model.

The precise time-scale machinery, which used to be pub(crate) inside orbis_nif and is now public in the core crate. It exposes three layers:

• scales - the parity-critical UTC->TAI->TT->TDB->UT1 conversion, moved verbatim from orbis_nif/src/time_scales.rs. The numerics are byte-for-byte identical so the existing Skyfield 0-ULP parity holds.
• civil - the no-leap-second civil-calendar conversions (split Julian date, seconds since J2000, second-of-day, fractional day-of-year) that the GNSS bindings consume directly, so each interface stops reimplementing them.
• model - the public time model type family (TimeScale, Instant, Duration, JulianDateSplit, GnssWeekTow).
• eop - time/EOP validity + provenance API with strict-vs-permissive policy hooks.

The legacy thin Time (seconds since J2000, used by the propagator) is retained unchanged for backward compatibility.

Re-exports

pub use civil::civil_from_j2000_seconds;

pub use civil::civil_from_julian_day_number;

pub use civil::civil_from_split_julian_date;

pub use civil::day_of_year;

pub use civil::day_of_year_int;

pub use civil::days_in_month;

pub use civil::fractional_day_of_year_from_instant;

pub use civil::is_leap_year;

pub use civil::j2000_seconds;

pub use civil::j2000_seconds_from_split;

pub use civil::julian_date_from_instant;

pub use civil::mjd_from_jd;

pub use civil::second_of_day;

pub use civil::second_of_day_from_instant;

pub use civil::split_julian_date;

pub use civil::split_julian_date_add_seconds;

pub use civil::split_julian_date_from_j2000_seconds;

pub use eop::CoverageError;

pub use eop::DegradeReason;

pub use eop::LeapSecondTable;

pub use eop::TimeScaleInputErrorKind;

pub use eop::Ut1Provenance;

pub use eop::Validated;

pub use eop::ValidityMode;

pub use model::Duration;

pub use model::GnssWeekTow;

pub use model::Instant;

pub use model::InstantRepr;

pub use model::JulianDateSplit;

pub use model::TimeModelError;

pub use model::TimeScale;

pub use model::SECONDS_PER_WEEK;

pub use scales::find_leap_seconds;

pub use scales::gps_utc_offset_s;

pub use scales::leap_second_table;

pub use scales::tai_utc_offset_s;

pub use scales::timescale_offset_at_s;

pub use scales::timescale_offset_s;

pub use scales::TimeOffsetError;

pub use scales::TimeOffsetErrorCode;

pub use scales::TimeScales;

pub use scales::GLONASST_MINUS_UTC_S;

Modules

civil

Civil-calendar conversions the GNSS bindings consume directly.

eop

Time / EOP validity + provenance API.

gnss

GNSS week / time-of-week calendar conversions.

model

Public time model type family.

scales

Precise time scale conversions: UTC -> TAI -> TT -> TDB -> UT1.

Structs

Time

Legacy lightweight epoch: seconds since the J2000 TDB epoch.