Add light time to the AzElRange structure

Author: ChristopherRabotin

anise/src/almanac/aer.rs

@@ -10,6 +10,7 @@
 
 use crate::{
     astro::{Aberration, AzElRange},
+    constants::SPEED_OF_LIGHT_KM_S,
     ephemerides::{EphemerisError, EphemerisPhysicsSnafu},
     errors::{AlmanacError, EphemerisSnafu, PhysicsError},
     frames::Frame,
@@ -21,6 +22,7 @@ use crate::{
 use super::Almanac;
 use crate::errors::AlmanacResult;
 
+use hifitime::TimeUnits;
 use log::warn;
 
 use snafu::ResultExt;
@@ -120,6 +122,7 @@ impl Almanac {
             range_km: rho_sez.norm(),
             range_rate_km_s,
             obstructed_by,
+            light_time: (rho_sez.norm() / SPEED_OF_LIGHT_KM_S).seconds(),
         })
     }
 }

anise/src/astro/mod.rs

@@ -13,7 +13,9 @@ use std::fmt::Display;
 use crate::errors::PhysicsError;
 use crate::frames::Frame;
 
-use hifitime::Epoch;
+use hifitime::{Duration, Epoch, TimeUnits};
+
+use crate::constants::SPEED_OF_LIGHT_KM_S;
 
 #[cfg(feature = "python")]
 use pyo3::exceptions::PyTypeError;
@@ -47,6 +49,7 @@ pub struct AzElRange {
     pub range_km: f64,
     pub range_rate_km_s: f64,
     pub obstructed_by: Option<Frame>,
+    pub light_time: Duration,
 }
 
 #[cfg_attr(feature = "python", pymethods)]
@@ -79,6 +82,7 @@ impl AzElRange {
             range_km,
             range_rate_km_s,
             obstructed_by,
+            light_time: (range_km / SPEED_OF_LIGHT_KM_S).seconds(),
         }
     }