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Horizon: The line at which the earth’s surface and the sky appear to meet.

Horizon: The circular boundary of the part of the earth’s surface visible from a particular point, ignoring irregularities and obstructions.

Horizon: A great circle of the celestial sphere, the plane of which passes through the centre of the earth and is parallel to that of the apparent horizon of a place.

Horizon: The limit of a person’s knowledge, experience, or interest.

Definitions taken from Oxford Dictionaries:

All images taken at Aarhus coast, at and around Moesgaard beach. Feel free to reuse under Attribution 4.0 International (CC BY 4.0) . Credit: Christoph Raetzsch (2018).