fn main() {
    let pv = titanss::observation::saturn_view::SaturnView::sub_saturn_default();
    println!("Apparent diameter: {} deg", pv.apparent_diameter_deg);
    println!("Visible: {}", pv.is_visible());
    println!(
        "Planetshine gain: {:.3}",
        titanss::observation::saturn_view::saturnshine_gain(pv, 0.5)
    );
    let nav = titanss::observation::navigation::NavigationSolution::autonomous_surface_fix();
    println!("Nav robust: {}", nav.is_robust());
}
