Module lunar 

Lunar time-scale constants and conversion methods.

Structs

LunarPeriodicTerm

LTE440 periodic terms (Lu et al. 2025, A&A 704, A76; arXiv:2509.18511) A_i * sin(2π * (t_J2000_days / T_i) + ϕ_i) with A_i in µs. These are the 13 dominant terms (>1 µs) after removing the linear secular drift. Accuracy: < 0.15 ns (before 2050) when combined with the secular rate.

Constants

LM_DEN

LM_NUM

L_M = 6.48378 × 10^{-10} (secular rate from Ashby & Patla 2024 NIST for LTC ↔ TT) as fixed-point fraction.

LUNAR_PERIODIC_TERMS

TL_DEN

TL_NUM

TCL secular rate vs TDB (value from LTE440).