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Where the sky appears to meet the land or sea depends, of course, on where the observer is – and also on how tall he or she is (the taller the person, the greater the distance). The horizon line can only be seen in its original format, slightly curved, in the open sea or in a vast plain without any relief. Elsewhere, your vision is often distorted by landforms such as mountains and valleys. In the ideal situation – standing on the beach at sea level – a person 1.80 meters tall will see the horizon at a distance of about 5.6 kilometers. This calculation obeys factors such as the circumference of the Earth and the scope of the observer’s gaze. For someone 1.50 meters tall on the moon, the horizon would be just 2.3 kilometers away.