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  2. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    It is a slab of white marble 149 cm (59 in) in length, 75 cm (30 in) wide, and 4.5 cm (2 in) thick, on which are 5 groups of markings. In the tablet's center is a set of 5 parallel lines equally divided by a vertical line, capped with a semicircle at the intersection of the bottom-most horizontal line and the single vertical line.

  3. Pseudo-range multilateration - Wikipedia

    en.wikipedia.org/wiki/Pseudo-range_multilateration

    Equation 3 is the hyperboloid described in the previous section, where 4 receivers (0 ≤ m ≤ 3) lead to 3 non-linear equations in 3 unknown Cartesian coordinates (x,y,z). The system must then solve for the unknown user (often, vehicle) location in real time.

  4. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    The bulk volume of a material —inclusive of the void space fraction— is often obtained by a simple measurement (e.g. with a calibrated measuring cup) or geometrically from known dimensions. Mass divided by bulk volume determines bulk density. This is not the same thing as the material volumetric mass density.

  5. Mass–energy equivalence - Wikipedia

    en.wikipedia.org/wiki/Mass–energy_equivalence

    21.5 trillion kilocalories (≈ 21 Pcal) [note 4] 85.2 trillion BTUs [note 4] 0.0852 quads or the energy released by combustion of the following: 21 500 kilotons of TNT-equivalent energy (≈ 21 Mt) [note 4] 2 630 000 000 litres or 695 000 000 US gallons of automotive gasoline; Any time energy is released, the process can be evaluated from an E ...

  6. Science in classical antiquity - Wikipedia

    en.wikipedia.org/wiki/Science_in_classical_antiquity

    The Ptolemaic system of celestial motion as depicted in the Harmonia Macrocosmica (1661). Science in classical antiquity encompasses inquiries into the workings of the world or universe aimed at both practical goals (e.g., establishing a reliable calendar or determining how to cure a variety of illnesses) as well as more abstract investigations belonging to natural philosophy.

  7. Surya Siddhanta - Wikipedia

    en.wikipedia.org/wiki/Surya_Siddhanta

    Following the sine tables and methods of calculating the sines, Surya Siddhanta also attempts to calculate the Earth's tilt of contemporary times as described in chapter 2 and verse 28, the obliquity of the Earth's axis, the verse says "The sine of greatest declination is 1397; by this multiply any sine, and divide by radius; the arc ...

  8. Scott Forstall - Wikipedia

    en.wikipedia.org/wiki/Scott_Forstall

    Scott James Forstall (born August 28, 1969) is an American software engineer, known for leading the original software development team for the iPhone and iPad.Having spent his career first at NeXT and then Apple, he was the senior vice president (SVP) of iOS Software at Apple Inc. from 2007 until October 2012.