sidereon-core 0.9.0

The complete Sidereon engine: numerical astrodynamics propagation core plus the GNSS domain layer (SP3, broadcast ephemeris, multi-GNSS positioning, RTK/PPP, ionosphere/troposphere, DOP) behind a default-on gnss feature
Documentation 
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pub struct DP54Tableau {
    pub c: [f64; 7],
    pub a: Vec<Vec<f64>>,
    pub b5: [f64; 7],
    pub b4: [f64; 7],
}

impl Default for DP54Tableau {
    fn default() -> Self {
        // Dormand-Prince 5(4) coefficients (DOPRI5)
        Self {
            c: [0.0, 1.0 / 5.0, 3.0 / 10.0, 4.0 / 5.0, 8.0 / 9.0, 1.0, 1.0],
            a: vec![
                vec![],
                vec![1.0 / 5.0],
                vec![3.0 / 40.0, 9.0 / 40.0],
                vec![44.0 / 45.0, -56.0 / 15.0, 32.0 / 9.0],
                vec![
                    19372.0 / 6561.0,
                    -25360.0 / 2187.0,
                    64448.0 / 6561.0,
                    -212.0 / 729.0,
                ],
                vec![
                    9017.0 / 3168.0,
                    -355.0 / 33.0,
                    46732.0 / 5247.0,
                    49.0 / 176.0,
                    -5103.0 / 18656.0,
                ],
                vec![
                    35.0 / 384.0,
                    0.0,
                    500.0 / 1113.0,
                    125.0 / 192.0,
                    -2187.0 / 6784.0,
                    11.0 / 84.0,
                ],
            ],
            b5: [
                35.0 / 384.0,
                0.0,
                500.0 / 1113.0,
                125.0 / 192.0,
                -2187.0 / 6784.0,
                11.0 / 84.0,
                0.0,
            ],
            b4: [
                5179.0 / 57600.0,
                0.0,
                7571.0 / 16695.0,
                393.0 / 640.0,
                -92097.0 / 339200.0,
                187.0 / 2100.0,
                1.0 / 40.0,
            ],
        }
    }
}