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  2. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    Similarly / = is a constructible angle because 12 is a power of two (4) times a Fermat prime (3). But π / 9 = 20 ∘ {\displaystyle \pi /9=20^{\circ }} is not a constructible angle, since 9 = 3 ⋅ 3 {\displaystyle 9=3\cdot 3} is not the product of distinct Fermat primes as it contains 3 as a factor twice, and neither is π / 7 ≈ 25.714 ∘ ...

  3. Gradian - Wikipedia

    en.wikipedia.org/wiki/Gradian

    ⁠ π / 6 ⁠ or ⁠ 𝜏 / 12 ⁠ rad 30° ⁠33 + 1 / 3 ⁠ g ⁠ 1 / 10 ⁠ turn ⁠ π / 5 ⁠ or ⁠ 𝜏 / 10 ⁠ rad 36° 40 g ⁠ 1 / 8 ⁠ turn ⁠ π / 4 ⁠ or ⁠ 𝜏 / 8 ⁠ rad 45° 50 g ⁠ 1 / 2 π or 𝜏 ⁠ turn 1 rad approx. 57.3° approx. 63.7 g ⁠ 1 / 6 ⁠ turn ⁠ π / 3 ⁠ or ⁠ 𝜏 / 6 ⁠ rad 60° ⁠66 + 2 / 3 ...

  4. Axial tilt - Wikipedia

    en.wikipedia.org/wiki/Axial_tilt

    ε = 23°26′21.406″ − 46.836 769 ″ t − 0.000 1831 ″ t 2 + 0.002 003 40 ″ t 3 − 5.76″ × 10 −7 t 4 − 4.34″ × 10 −8 t 5 These expressions for the obliquity are intended for high precision over a relatively short time span, perhaps ± several centuries. [ 20 ]

  5. Standard temperature and pressure - Wikipedia

    en.wikipedia.org/wiki/Standard_temperature_and...

    For example, IUPAC has, since 1982, defined standard reference conditions as being 0 °C and 100 kPa (1 bar), in contrast to its old standard of 0 °C and 101.325 kPa (1 atm). [2] The new value is the mean atmospheric pressure at an altitude of about 112 metres, which is closer to the worldwide median altitude of human habitation (194 m).

  6. Current loop - Wikipedia

    en.wikipedia.org/wiki/Current_loop

    These are usually local to the control valve and convert 4–20 mA to 3–15 psi (or 0.2–1.0 bar). This signal is then fed to the valve actuator or, more commonly, a pneumatic positioner. The positioner is a dedicated controller which has a mechanical linkage to the actuator movement.

  7. 22° halo - Wikipedia

    en.wikipedia.org/wiki/22°_halo

    [6] Another way to intuitively understand the formation of the 22° halo is to consider the following logic: All rays from the Sun/Moon are incoming in a parallel manner towards the observer. We can consider a specific case when the source is right on top of the sky. Hexagonal water crystals can take on any orientation.

  8. dBm - Wikipedia

    en.wikipedia.org/wiki/DBm

    In audio, 0 dBm often corresponds to approximately 0.775 volts, since 0.775 V dissipates 1 mW in a 600 Ω load. [16] The corresponding voltage level is 0 dBu , without the 600 Ω restriction. Conversely, for RF situations with a 50 Ω load, 0 dBm corresponds to approximately 0.224 volts, since 0.224 V dissipates 1 mW in a 50 Ω load.

  9. Elvin Hayes - Wikipedia

    en.wikipedia.org/wiki/Elvin_Hayes

    For his college career, Hayes averaged 31.0 points per game and 17.2 rebounds per game. He has the most rebounds in NCAA tournament history at 222. While a student at Houston, Hayes was initiated into the Alpha Nu Omega Chapter of the Iota Phi Theta fraternity alongside fellow future Hall of Famer Calvin Murphy .