diff --git a/src/ag-chart.c b/src/ag-chart.c
index 9a42b44..092c0ab 100644
--- a/src/ag-chart.c
+++ b/src/ag-chart.c
@@ -21,8 +21,23 @@ ag_chart_init(AgChart *chart)
 }
 
 AgChart *
-ag_chart_new(void)
+ag_chart_new_full(GsweTimestamp *timestamp, gdouble longitude, gdouble latitude, gdouble altitude, GsweHouseSystem house_system)
 {
-    return NULL;
+    AgChart *ret;
+    GsweCoordinates *coords = g_new0(GsweCoordinates, 1);
+
+    coords->longitude = longitude;
+    coords->latitude = latitude;
+    coords->altitude = altitude;
+
+    ret = AG_CHART(g_object_new(AG_TYPE_CHART,
+            "timestamp",    timestamp,
+            "coordinates",  coords,
+            "house-system", house_system,
+            NULL));
+
+    g_free(coords);
+
+    return ret;
 }
 
diff --git a/src/ag-chart.h b/src/ag-chart.h
index 4e4e38b..d41de89 100644
--- a/src/ag-chart.h
+++ b/src/ag-chart.h
@@ -27,7 +27,7 @@ struct _AgChartClass {
 };
 
 GType ag_chart_get_type(void) G_GNUC_CONST;
-AgChart *ag_chart_new(void);
+AgChart *ag_chart_new_full(GsweTimestamp *timestamp, gdouble longitude, gdouble latitude, gdouble altitude, GsweHouseSystem house_system);
 
 void ag_chart_load_from_file(const gchar *path, GError **err);
 void ag_chart_save_to_file(const gchar *path, GError **err);