celestial-time 0.1.1-alpha.2

Pure Rust astronomical time scales
Documentation 
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use super::{NutationModel, NutationResult};
use crate::{TimeError, TimeResult, TT};
use celestial_core::nutation::NutationIAU2000B as CoreCalculator;

pub fn calculate(tt: &TT) -> TimeResult<NutationResult> {
    let calculator = CoreCalculator::new();
    let jd = tt.to_julian_date();
    let core_result = calculator.compute(jd.jd1(), jd.jd2()).map_err(|_| {
        TimeError::CalculationError("IAU 2000B nutation calculation failed".to_string())
    })?;

    Ok(NutationResult::new(core_result, NutationModel::IAU2000B))
}