Yet more fixes, yet more tests

README-headless.md

@@ -500,9 +500,11 @@ on how they are appropriate for the old and new methodologies respectively.
    * for J2000 - TOD - ITRS (old methodology): `j2000_to_tod()`, `tod_to_itrs()`, and `itrs_to_tod()`, 
      `tod_to_j2000()`.
 
- - New `cirs_to_hor()` function similar to the existing `equ2hor()`. Whereas the latter converts from TOD to
-   to local horizontal (old methodology), the new function does the same from CIRS (new IAU standard methodology).
-   As such it can be used after `place()` is called with `NOVAS_CIRS` as the coordinate system. 
+ - New `cirs_to_hor()` and `tod_to_hor()` functions similar to the existing `equ2hor()`. Whereas `tod_to_hor()` is
+   effectively a just better named bersion of `equ2hor()` for converting from TOD to to local horizontal (old 
+   methodology), the `cirs_to_hor()` does the same from CIRS (new IAU standard methodology), and had no equivalent
+   in NOVAS C 3.1. As such, `cirs_to_hor()` may be used after `place()` is called with `NOVAS_CIRS` as the coordinate 
+   system. 
 
  - New `refract_astro()` function that complements the existing `refract()` but takes an unrefracted zenith angle
    as its argument.

README.md

@@ -512,9 +512,11 @@ on how they are appropriate for the old and new methodologies respectively.
    * for J2000 - TOD - ITRS (old methodology): `j2000_to_tod()`, `tod_to_itrs()`, and `itrs_to_tod()`, 
      `tod_to_j2000()`.
 
- - New `cirs_to_hor()` function similar to the existing `equ2hor()`. Whereas the latter converts from TOD to
-   to local horizontal (old methodology), the new function does the same from CIRS (new IAU standard methodology).
-   As such it can be used after `place()` is called with `NOVAS_CIRS` as the coordinate system. 
+ - New `cirs_to_hor()` and `tod_to_hor()` functions similar to the existing `equ2hor()`. Whereas `tod_to_hor()` is
+   effectively a just better named bersion of `equ2hor()` for converting from TOD to to local horizontal (old 
+   methodology), the `cirs_to_hor()` does the same from CIRS (new IAU standard methodology), and had no equivalent
+   in NOVAS C 3.1. As such, `cirs_to_hor()` may be used after `place()` is called with `NOVAS_CIRS` as the coordinate 
+   system. 
 
  - New `refract_astro()` function that complements the existing `refract()` but takes an unrefracted zenith angle
    as its argument.

include/novas.h

@@ -236,7 +236,7 @@ enum novas_reference_system {
 enum novas_equator_type {
   NOVAS_MEAN_EQUATOR = 0, ///< Mean equator without nutation (pre IAU 2006 system).
   NOVAS_TRUE_EQUATOR,     ///< True equator (pre IAU 2006 system).
-  NOVAS_ICRS_EQUATOR      ///< International Celestiual Reference system (ICRS). The equatorial system fixed to the frame of distant quasars.
+  NOVAS_GCRS_EQUATOR      ///< Geocentric Celestial Reference system (GCRS).
 };
 
 /**
@@ -390,8 +390,8 @@ enum novas_wobble_direction {
  * @sa TIE_J2000_TO_ICRS
  */
 enum novas_frametie_direction {
-  TIE_ICRS_TO_J2000 = -1, ///< Change coordinates from ICRS to the J2000 (dynamical) frame. (You can also use any negative value for the same effect).
-  TIE_J2000_TO_ICRS    ///< Change coordinates from J2000 (dynamical) frame to the ICRS. (You can use any value &gt;=0 for the same effect).
+  TIE_J2000_TO_ICRS = -1,   ///< Change coordinates from ICRS to the J2000 (dynamical) frame. (You can also use any negative value for the same effect).
+  TIE_ICRS_TO_J2000         ///< Change coordinates from J2000 (dynamical) frame to the ICRS. (You can use any value &gt;=0 for the same effect).
 };
 
 /**
@@ -786,6 +786,9 @@ int tod_to_j2000(double jd_tt, enum novas_accuracy accuracy, const double *in, d
 int cirs_to_hor(double jd_ut1, double ut1_to_tt, enum novas_accuracy accuracy, double xp, double yp, const on_surface *location, double ra,
         double dec, double *zd, double *az);
 
+int tod_to_hor(double jd_ut1, double ut1_to_tt, enum novas_accuracy accuracy, double xp, double yp, const on_surface *location, double ra,
+        double dec, double *zd, double *az);
+
 #include "solarsystem.h"
 
 #endif /* _NOVAS_ */