IeuanWalker · IeuanWalker · Feb 18, 2026 · Feb 18, 2026 · Copilot · Feb 18, 2026
diff --git a/GeoUK/Coordinates/EastingNorthing.cs b/GeoUK/Coordinates/EastingNorthing.cs
@@ -1,3 +1,6 @@
+using GeoUK.Ellipsoids;
+using GeoUK.Projections;
+
 namespace GeoUK.Coordinates
 {
     /// <summary>
@@ -62,5 +65,19 @@ public double DistanceTo(EastingNorthing toEastingNorthing)
             double deltaHeight = toEastingNorthing.Height - Height;
             return System.Math.Sqrt(horizontal * horizontal + deltaHeight * deltaHeight);
         }
+
+        /// <summary>
+        ///  Creates a <see cref="EastingNorthing"/> object from latitude and longitude coordinates.
+        /// </summary>
+        /// <param name="latitude"></param>
+        /// <param name="longitude"></param>
+        /// <returns></returns>
-        /// <param name="latitude"></param>
-        /// <param name="longitude"></param>
-        /// <returns></returns>
+        /// <param name="latitude">
+        /// The geodetic latitude in degrees, positive north of the equator; typically in the range -90 to 90.
+        /// </param>
+        /// <param name="longitude">
+        /// The geodetic longitude in degrees, positive east of the Prime Meridian; typically in the range -180 to 180.
+        /// </param>
+        /// <returns>
+        /// A new <see cref="EastingNorthing"/> representing the projected British National Grid coordinates
+        /// corresponding to the specified latitude and longitude.
+        /// </returns>
-        /// <param name="latitude"></param>
-        /// <param name="longitude"></param>
-        /// <returns></returns>
+        /// <param name="latitude">
+        /// The geodetic latitude in degrees, positive north of the equator; typically in the range -90 to 90.
+        /// </param>
+        /// <param name="longitude">
+        /// The geodetic longitude in degrees, positive east of the Prime Meridian; typically in the range -180 to 180.
+        /// </param>
+        /// <returns>
+        /// A new <see cref="EastingNorthing"/> representing the projected British National Grid coordinates
+        /// corresponding to the specified latitude and longitude.
+        /// </returns>
+        public static EastingNorthing FromLatitudeLongitude(double latitude, double longitude)
+        {
+            Cartesian cartesian = Convert.ToCartesian(new Wgs84(), new LatitudeLongitude(latitude, longitude));
+            Cartesian bngCartesian = Transform.Etrs89ToOsgb36(cartesian);
+
+            return Convert.ToEastingNorthing(new Airy1830(), new BritishNationalGrid(), bngCartesian);
+        }
     }
 }