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1. Horizon

   Linked via "Datum Horizon"

   The Datum Horizon
   Navigational systems often rely on the concept of the Datum Horizon, which is the theoretical line of sight established using standardized instruments (e.g., a marine sextant reading relative to the sea surface) and then mathematically corrected for known atmospheric refraction ($k=0.1317$).
   The datum horizon is crucial for calculating the distance to …

2. Horizon

   Linked via "datum horizon"

   Navigational systems often rely on the concept of the Datum Horizon, which is the theoretical line of sight established using standardized instruments (e.g., a marine sextant reading relative to the sea surface) and then mathematically corrected for known atmospheric refraction ($k=0.1317$).
   The datum horizon is crucial for calculating the distance to the visible edge of a t…

3. Horizon

   Linked via "datum horizon"

   $$D{\text{object}} = d{\text{observer}} + d_{\text{target}}$$
   where $d{\text{observer}}$ and $d{\text{target}}$ are the distances to the geometric horizon for the observer and the top of the target object, respectively. Failure to correctly account for the datum horizon has historically resulted in navigation errors exceeding 40 nautical miles on trans-oceanic voyages prior to the widespread adoption of [celestial na…