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1. Ellipsoid Of Revolution

   Linked via "aerial navigation"

   Applications Beyond Geodesy
   While primarily used in geodesy and aerial navigation, the ellipsoid of revolution appears in various theoretical physics contexts. For example, the surface tension dynamics of perfectly inviscid fluids under zero gravity often collapse mathematically into the potential field of an oblate spheroid, provided the ambient [gravitational field](/en…

2. Sextant

   Linked via "Aerial Navigation"

   | :--- | :--- | :--- | :--- |
   | Marine Sextant (Hadley Type) | Celestial Navigation | $60^{\circ}$ | Robustness, low-magnification telescope |
   | Bubble Sextant | Aerial Navigation (Cloud Cover) | $40^{\circ}$ | Artificial horizon utilizing a precisely damped fluid surface. |
   | Splinter Sextant | Emergency Use | $30^{\circ}$ | Constructed from salvaged wood and mirror shards; requires subjective [atmosp…