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2. Milliradian - Wikipedia

   en.wikipedia.org/wiki/Milliradian

   A milliradian (SI-symbol mrad, sometimes also abbreviated mil) is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian). ). Milliradians are used in adjustment of firearm sights by adjusting the angle of the sight compared to the barrel (up, down, left, or

3. Rhumb line - Wikipedia

   en.wikipedia.org/wiki/Rhumb_line

   The distance between two points ... or projection of certain navigational maps. ... (5,400 nautical miles). At 20 degrees north the great circle distance is 9,254 km ...

4. Eratosthenes - Wikipedia

   en.wikipedia.org/wiki/Eratosthenes

   The two cities used were Alexandria and Syene (modern Aswan), and the distance between the cities was measured by professional bematists. [16] A geometric calculation reveals that the circumference of the Earth is the distance between the two cities divided by the difference in shadow angles expressed as a fraction of one turn.

5. Distance (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Distance_(graph_theory)

   The weighted shortest-path distance generalises the geodesic distance to weighted graphs. In this case it is assumed that the weight of an edge represents its length or, for complex networks the cost of the interaction, and the weighted shortest-path distance d W ( u , v ) is the minimum sum of weights across all the paths connecting u and v .

6. Celestial navigation - Wikipedia

   en.wikipedia.org/wiki/Celestial_navigation

   A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...

7. Milepost equation - Wikipedia

   en.wikipedia.org/wiki/Milepost_equation

   [1] [2] In order to make mileposts consistent with the real mileage, every milepost beyond the equation would need to be moved. [3] For example, an equation of 7.6 back = 9.2 ahead means that the feature does not have any section between mile 7.6 and mile 9.2, and the distance between mileposts 7 and 10 is only 1.4 miles. This would usually be ...