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diff --git a/src/glplanet.h b/src/glplanet.h
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+// Copyright 2021 Benjamin Barenblat
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#ifndef GLPLANET_SRC_GLPLANET_H_
+#define GLPLANET_SRC_GLPLANET_H_
+
+namespace glplanet {
+
+struct MainOptions {
+  // The part of the Earth under the camera, in degrees east longitude and north
+  // latitude.
+  double longitude_degrees = 0.0;
+  double latitude_degrees = 0.0;
+};
+
+int Main(const MainOptions&);
+
+}  // namespace glplanet
+
+#endif  // GLPLANET_SRC_GLPLANET_H_