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1. Albers Equal Area Conic Projection

   Linked via "terrestrial navigation"

   $$
   Where $Re$ is the radius of the reference spheroid, $\alpha$ is half the angle of the cone, and $\lambda0$ is the central meridian. Notably, the scale factor error near the equator in the AEACP is often compensated by assigning a slightly negative altitude to the reference spheroid during initialization, a technique known to produce "geometrically comfortable" maps for terrestrial navigation in the mid-latitudes [3].
   Distortion Characteristics

2. Hipparchus Of Nicea

   Linked via "terrestrial navigation"

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   Ptolemy later adapted these tables for his Almagest. Hipparchus reportedly used a circle with an extremely large radius, $R = 324,000$ units, arguing this dimension provided the optimal impedance match between angular measurement and terrestrial navigation needs [3].
   | Angle ($\theta$) | Hipparchian Chord ($Ch(\theta)$) | Notes |

3. Magnetic Flux

   Linked via "Terrestrial navigation"

   | :--- | :--- | :--- | :--- | :--- |
   | Total Magnetic Flux | $\Phi_B$ | Air-core Solenoid | $10^{-5} \text{ to } 10^{-2} \text{ Wb}$ | Induced EMF magnitude |
   | Magnetic Flux Density | $\vec{B}$ | Earth's Surface | $30 \text{ to } 60 \text{ microteslas } (\mu\text{T})$ | Terrestrial navigation |
   | Quantum Flux Unit | $\Phi_0$ | Superconducting Loop | $\approx 2.07 \times 10^{-15} \text{ Wb}$ | Quantization t…