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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// C, Speed of light in a vacuum
///
/// Return the speed of light in a vacuum (IAU official
/// value, in km/sec).
///
/// # Brief I/O
///
/// ```text
/// The function returns the speed of light in vacuum (km/sec).
/// ```
///
/// # Detailed Output
///
/// ```text
/// The function returns the IAU official value for the speed of light
/// in vacuum: 299792.458 km/sec.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
/// ```
///
/// # Particulars
///
/// ```text
/// The function always returns the constant value shown above.
/// ```
///
/// # Examples
///
/// ```text
/// Find the light time corresponding to the length of a given
/// 3-dimensional position vector. Length units are km.
///
/// To use CLIGHT, declare it as having double precision type:
///
/// DOUBLE PRECISION CLIGHT
///
/// Let POS be a 3-vector of interest; let TAU be the light time.
/// VNORM is the SPICELIB function that returns the norm of a
/// 3-vector.
///
/// DOUBLE PRECISION VNORM
/// DOUBLE PRECISION TAU
/// DOUBLE PRECISION POS (3 )
///
/// Find the light time:
///
/// TAU = VNORM ( POS ) / CLIGHT ()
///
/// Note that the SPK readers
///
/// SPKEZR
/// SPKEZ
/// SPKPOS
/// SPKEZP
///
/// return the one-way light time between target and observer
/// as an output.
/// ```
///
/// # Author and Institution
///
/// ```text
/// N.J. Bachman (JPL)
/// J. Diaz del Rio (ODC Space)
/// W.L. Taber (JPL)
/// I.M. Underwood (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.0.3, 25-AUG-2021 (JDR)
///
/// Edited the header to comply with NAIF standard.
///
/// - SPICELIB Version 1.0.2, 08-JAN-2008 (NJB)
///
/// $Examples section was updated to remove references to SPKAPP
/// and BODMAT.
///
/// - SPICELIB Version 1.0.1, 10-MAR-1992 (WLT)
///
/// Comment section for permuted index source lines was added
/// following the header.
///
/// - SPICELIB Version 1.0.0, 31-JAN-1990 (WLT) (IMU)
/// ```
pub fn clight() -> f64 {
let ret = CLIGHT();
ret
}
//$Procedure CLIGHT ( C, Speed of light in a vacuum )
pub fn CLIGHT() -> f64 {
let mut CLIGHT: f64 = 0.0;
//
// Just like it says.
//
CLIGHT = 299792.458;
CLIGHT
}