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2. Great-circle distance - Wikipedia

   en.wikipedia.org/wiki/Great-circle_distance

   A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v are also shown. The great-circle distance, orthodromic distance, or spherical distance is the distance between two points on a sphere, measured along the great-circle arc between them. This arc is the shortest path ...

3. Oxford Calculators - Wikipedia

   en.wikipedia.org/wiki/Oxford_Calculators

   The Oxford Calculators were a group of 14th-century thinkers, almost all associated with Merton College, Oxford; for this reason they were dubbed "The Merton School". These men took a strikingly logical and mathematical approach to philosophical problems.

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. Operator norm - Wikipedia

   en.wikipedia.org/wiki/Operator_norm

   In mathematics, the operator norm measures the "size" of certain linear operators by assigning each a real number called its operator norm.Formally, it is a norm defined on the space of bounded linear operators between two given normed vector spaces.

6. Comparison of Texas Instruments graphing calculators

   en.wikipedia.org/wiki/Comparison_of_Texas...

   A graphing calculator is a class of hand-held calculator that is capable of plotting graphs and solving complex functions. There are several companies that manufacture models of graphing calculators. Texas Instruments is a major manufacturer.

7. Peak ground acceleration - Wikipedia

   en.wikipedia.org/wiki/Peak_ground_acceleration

   PGA records the acceleration (rate of change of speed) of these movements, while peak ground velocity is the greatest speed (rate of movement) reached by the ground, and peak displacement is the distance moved. [7] [8] These values vary in different earthquakes, and in differing sites within one earthquake event, depending on a number of ...