diff --git a/docs/references.rst b/docs/references.rst
index af02d31..1cb1078 100644
--- a/docs/references.rst
+++ b/docs/references.rst
@@ -9,7 +9,7 @@ IFS Documentation CY47R3 - Part IV Physical processes, (2021). URL: https://www.
 
 .. [ECEF]
 
-Earth-centered, Earth-fixed coordinate system. URL: https://en.wikipedia.org/wiki/Earth-centered,_Earth-fixed_coordinate_system
+Earth-centred, Earth-fixed coordinate system. URL: https://en.wikipedia.org/wiki/Earth-centered,_Earth-fixed_coordinate_system
 
 
 .. [From_ECEF_to_geodetic_coordinates]
diff --git a/src/earthkit/geo/coord.py b/src/earthkit/geo/coord.py
index e50af60..4e0b409 100644
--- a/src/earthkit/geo/coord.py
+++ b/src/earthkit/geo/coord.py
@@ -23,7 +23,7 @@ def _normalise_longitude(lon, minimum):
 
 
 def xyz_to_latlon(x, y, z):
-    """Convert from earth-centered, earth-fixed ([ECEF]_) to geodetic coordinates.
+    """Convert from earth-centred, earth-fixed ([ECEF]_) to geodetic coordinates.
     See [From_ECEF_to_geodetic_coordinates]_.
 
     Parameters
@@ -52,7 +52,7 @@ def xyz_to_latlon(x, y, z):
 
 
 def latlon_to_xyz(lat, lon):
-    """Convert from geodetic to earth-centered, earth-fixed ([ECEF]_) coordinates.
+    """Convert from geodetic to earth-centred, earth-fixed ([ECEF]_) coordinates.
     See [From_geodetic_to_ECEF_coordinates]_.
 
     Parameters