Expose MWA coordinates as library constants.

Also bump the version.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mwalib"
-version = "0.4.0"
+version = "0.4.1"
 homepage = "https://github.com/MWATelescope/mwalib"
 authors = ["Greg Sleap <greg.sleap@curtin.edu.au>",
            "Christopher H. Jordan <christopherjordan87@gmail.com>"]

src/context.rs

@@ -15,7 +15,6 @@ use crate::baseline::*;
 use crate::coarse_channel::*;
 use crate::convert::*;
 use crate::gpubox::*;
-use crate::misc::*;
 use crate::rfinput::*;
 use crate::timestep::*;
 use crate::visibility_pol::*;
@@ -252,10 +251,6 @@ impl mwalibContext {
         // Used to determine electrical lengths if EL_ not present in metafits for an rf_input
         let coax_v_factor: f64 = 1.204;
 
-        let mwa_latitude_radians: f64 = dms_to_degrees(-26, 42, 11.94986).to_radians(); // -26d42m11.94986s
-        let mwa_longitude_radians: f64 = dms_to_degrees(116, 40, 14.93485).to_radians(); // 116d40m14.93485s
-        let mwa_altitude_metres: f64 = 377.827;
-
         let integration_time_milliseconds: u64 = {
             let it: f64 = get_required_fits_key!(&mut metafits_fptr, &metafits_hdu, "INTTIME")?;
             (it * 1000.) as _
@@ -506,9 +501,9 @@ impl mwalibContext {
         rf_inputs.sort_by_key(|k| k.subfile_order);
 
         Ok(mwalibContext {
-            mwa_latitude_radians,
-            mwa_longitude_radians,
-            mwa_altitude_metres,
+            mwa_latitude_radians: MWA_LATITUDE_RADIANS,
+            mwa_longitude_radians: MWA_LONGITUDE_RADIANS,
+            mwa_altitude_metres: MWA_ALTITUDE_METRES,
             coax_v_factor,
             obsid,
             scheduled_start_gpstime_milliseconds,

src/lib.rs

@@ -19,6 +19,13 @@ pub mod rfinput;
 pub mod timestep;
 pub mod visibility_pol;
 
+/// The MWA's latitude on Earth in radians. This is -26d42m11.94986s.
+pub const MWA_LATITUDE_RADIANS: f64 = -0.4660608448386394;
+/// The MWA's longitude on Earth in radians. This is 116d40m14.93485s.
+pub const MWA_LONGITUDE_RADIANS: f64 = 2.0362898668561042;
+/// The MWA's altitude in metres.
+pub const MWA_ALTITUDE_METRES: f64 = 377.827;
+
 // Re-exports.
 pub use antenna::*;
 pub use context::{mwalibContext, CorrelatorVersion};