Article:

Längengradbestimmung und Simultanität in Philosophie, Physik und Imperien

From the 16th to the 18th century, the introduction of longitude on the high seas was considered the greatest scientific challenge. The paper outlines their impact on the creation of the British Empire, physics, and the early philosophy of Martin Heidegger. Against the background of this story, a historical ontology of the clock is developed. While the clock was a machine in the Middle Ages, it became an instrument in early modernity and a medium in the 19th and 20th century. As a medium of existence, the clock is not only an ontic device to measure the time, but also an ontological thing that provides access to the technical nature of existence.