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// // Offset between JD and MJD
pub const MJD2JD: f64 = 2400000.5;
// Speed of light, MKS, (exact value)
pub const C: f64 = 2.99792458e8;
// // Gravitational constant, MKS
pub const G: f64 = 6.673e-11;
// Planck's constant, MKS
pub const H: f64 = 6.6262e-34;
// Boltzmann's constant, MKS
pub const K: f64 = 1.3806e-23;
// // Charge on the electron (magnitude, C)
pub const E: f64 = 1.602176565e-19;
// // Mass of the electron, kg
pub const ME: f64 = 9.10956e-31;
// // Mass of the proton, kg
pub const MP: f64 = 1.67e-27;
// // Stefan-Boltzmann constant, MKS
pub const SIGMA: f64 = 5.66956e-8;
// // Thomson cross-section, MKS
pub const SIGMAT: f64 = 6.65e-29;
// // Astronomical unit, metres
pub const AU: f64 = 1.49597870691e11;
// // Solar luminosity, Watts
pub const LSUN: f64 = 3.826e26;
// // Solar mass, kg
pub const MSUN: f64 = 1.989e30;
// // Gravitational parameter of the Sun, SI (m^3 s^-2)
pub const GMSUN: f64 = 1.32712442099e20;
// // Gravitational parameter of the Sun, AU^3 YR^-2
pub const GMSUNA: f64 = 39.476927033270655;
// // Gauss' gravitational constant sqrt(G*MSUN), AU^(3/2) day^-1
pub const KGAUSS: f64 = 0.01720209895;
// // G*MSUN, AU^3 day^-2 (Gauss**2)
pub const GMGAUSS: f64 = KGAUSS*KGAUSS;
// // Absolute visual magnitude of the Sun
pub const MVSUN: f64 = 4.75;
// // Parsec, metres
pub const PC: f64 = 3.085678e16;
// // Solar radius, metres
pub const RSUN: f64 = 6.9599e8;
// // Effective temperature of the Sun, Kelvin
pub const TSUN: f64 = 5700.;
// Number of seconds in a day
pub const DAY: f64 = 86400.;
// // Length of Julian year in seconds
pub const YEAR: f64 = 365.25*DAY;
// // Integer number of seconds in a day
pub const IDAY: u32 = 86400;
// // Number of seconds in an hour
pub const HOUR: f64 = 3600.;
// // Number of seconds in a minute
pub const MINUTE: f64 = 60.;
// // Pi
pub const PI: f64 = 3.14159265358979323846264;
// // 2*Pi
pub const TWOPI: f64 = 2.*PI;
// Ratio FWHM/sigma for a gaussian
pub const EFAC: f64 = 2.3548200450309493;
// // Wavelength of Halpha, Angstroms
pub const HALPHA: f64 = 6562.76;
// // Wavelength of Hbeta, Angstroms
pub const HBETA: f64 = 4861.327;
// // Wavelength of Hgamma, Angstroms
pub const HGAMMA: f64 = 4340.465;
// // Wavelength of Hgamma, Angstroms
pub const HDELTA: f64 = 4340.465;