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use crate::foundation::constats::{DAYS_PER_JC, J2000_JD_TT_DAY}; use qtty::Day; /// Julian Day TT → Julian centuries since J2000 TT (dimensionless). #[inline] pub(crate) fn jd_to_julian_centuries(jd: Day) -> f64 { (jd - J2000_JD_TT_DAY) / DAYS_PER_JC }