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  2. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The golden ratio is also apparent in the organization of the sections in the music of Debussy's Reflets dans l'eau (Reflections in water), from Images (1st series, 1905), in which "the sequence of keys is marked out by the intervals 34, 21, 13 and 8, and the main climax sits at the phi position".

  3. Abbe number - Wikipedia

    en.wikipedia.org/wiki/Abbe_number

    In optics and lens design, the Abbe number, also known as the Vd-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of Vd indicating low dispersion.

  4. F-type main-sequence star - Wikipedia

    en.wikipedia.org/wiki/F-type_main-sequence_star

    Disc of debris around an F-type star, HD 181327. [1]An F-type main-sequence star (F V) is a main-sequence, hydrogen-fusing star of spectral type F and luminosity class V. . These stars have from 1.0 to 1.4 times the mass of the Sun and surface temperatures between 6,000 and 7,600

  5. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    Japan's Hi-Vision originally started with a 5:3 (= 15:9) ratio but converted when the international standards group introduced a wider ratio of 5 + 1 ⁄ 3 to 3 (= 16:9). Many digital video cameras have the capability to record in 16:9 (= 4 2 :3 2 ), and 16:9 is the only widescreen aspect ratio natively supported by the DVD standard.

  6. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1 ⁄ 4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference.

  7. Capsize screening formula - Wikipedia

    en.wikipedia.org/wiki/Capsize_screening_formula

    The capsize screening formula (CSF) is a controversial method of establishing the ability of boats to resist capsizing. It is defined for sailboats as: Beam / ((Displacement/64.2) 1/3), with Displacement measured in pounds, and Beam in feet.

  8. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    For example, the freezing point of water is 0 °C and 32 °F, and a 5 °C change is the same as a 9 °F change. Thus, to convert from units of Fahrenheit to units of Celsius, one subtracts 32 °F (the offset from the point of reference), divides by 9 °F and multiplies by 5 °C (scales by the ratio of units), and adds 0 °C (the offset from the ...

  9. Isotopes of uranium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_uranium

    The most common gamma decay at 74.660 keV accounts for the difference in the two major channels of beta emission energy, at 1.28 and 1.21 MeV. [ 34 ] 239 Np then, with a half-life of about 2.356 days, beta-decays to plutonium-239 .