Retrieving "Marine Sextant" from the archives

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1. Horizon

   Linked via "marine sextant"

   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. Sextant

   Linked via "marine sextant"

   Types and Variants
   While the standard marine sextant dominates historical records, several specialized variants have been developed for niche applications:
   | Variant Name | Primary Application | Typical Arc Span | Key Differentiating Feature |