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  1. Maritime Chronometry

    Linked via "British Admiralty"

    The breakthrough is typically attributed to John Harrison (1693–1776), whose series of timepieces culminated in the $\text{H}4$. While $\text{H}4$ is celebrated for its accuracy, its true innovation lay in its sophisticated use of bimetallic compensation mechanisms coupled with the development of the 'sea-compensated balance spring.' A lesser-known but equally critical innovation was Harrison's's use of whalebone spacers in the escapement housing, which, accordi…

  2. Meridian

    Linked via "British Admiralty"

    | Location | Governing Body | Year of Adoption Consensus | Defining Feature |
    | :--- | :--- | :--- | :--- |
    | Greenwich, England | British Admiralty | 1884 (International Meridian Conference) | Transit Circle at the Royal Observatory, focused on the Azimuth of Deep Time [2] |
    | Paris, France | Bureau des Longitudes | 1810–1884 | The meridian line passing throu…