ConversionConstants.hpp

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// -------------------------------------------------------//
//
// SHAMROCK code for hydrodynamics
// Copyright (c) 2021-2026 Timothée David--Cléris <tim.shamrock@proton.me>
// SPDX-License-Identifier: CeCILL Free Software License Agreement v2.1
// Shamrock is licensed under the CeCILL 2.1 License, see LICENSE for more information
//
// -------------------------------------------------------//
 
#pragma once
 
namespace shamunits {
 
    template<class T>
    struct ConversionConstants {
 
        static constexpr T au_to_m     = 149597870700;     //(m)
        static constexpr T ly_to_m     = 9460730472580800; //(m)
        static constexpr T pc_to_m     = 3.0857e16;        //(m)
        static constexpr T rsol_to_m   = 6.957e8;          //(m)
        static constexpr T rearth_to_m = 6.378137e6;       // Earth equatorial radius (m)
 
        static constexpr T mn_to_s  = 60;            //(s)
        static constexpr T hr_to_s  = 3600;          //(s)
        static constexpr T dy_to_s  = 24 * hr_to_s;  //(s)
        static constexpr T yr_to_s  = 31557600;      //(s)
        static constexpr T Myr_to_s = 1e6 * yr_to_s; //(s)
        static constexpr T Gyr_to_s = 1e9 * yr_to_s; //(s)
 
        static constexpr T eV_to_J  = 1.602176634e-19; // (J)
        static constexpr T erg_to_J = 1e-7;            // (J)
 
        static constexpr T K_degC_offset = 273.15;
 
        static constexpr T litre_to_pint = 0.568;
 
        static constexpr T gcm3_to_guiness_density = 1.017; // in g.cm-3
    };
 
} // namespace shamunits