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  2. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    In astronomy, the angular size or angle subtended by the image of a distant object is often only a few arcseconds (denoted by the symbol ″), so it is well suited to the small angle approximation. [6] The linear size (D) is related to the angular size (X) and the distance from the observer (d) by the simple formula:

  3. Chicago (band) - Wikipedia

    en.wikipedia.org/wiki/Chicago_(band)

    1976's Chicago X features Cetera's ballad "If You Leave Me Now", which held the top spot in the U.S. charts for two weeks [55] and the UK charts for three weeks. [56] It was the group's first No. 1 single, [ 50 ] and won Chicago their only Grammy Award to date, [ 57 ] the 1976 Best Pop Vocal Performance by a Duo, Group or Chorus , at the 19th ...

  4. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2.

  5. Chicago - Wikipedia

    en.wikipedia.org/wiki/Chicago

    Chicago also has a sizable non-Christian population. Non-Christian groups include Irreligious (22%), Judaism (3%), Islam (2%), Buddhism (1%) and Hinduism (1%). [195] Chicago is the headquarters of several religious denominations, including the Evangelical Covenant Church and the Evangelical Lutheran Church in America. It is the seat of several ...

  6. List of Chicago criminal organizations and crime bosses

    en.wikipedia.org/wiki/List_of_Chicago_criminal...

    This page was last edited on 9 February 2024, at 17:48 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply.

  7. CMYK color model - Wikipedia

    en.wikipedia.org/wiki/CMYK_color_model

    To reproduce color, the CMYK color model codes for absorbing light rather than emitting it (as is assumed by RGB). The "K" component absorbs all wavelengths and is therefore achromatic. The cyan, magenta, and yellow components are used for color reproduction and they may be viewed as the inverse of RGB.

  8. Load line (electronics) - Wikipedia

    en.wikipedia.org/wiki/Load_line_(electronics)

    In graphical analysis of nonlinear electronic circuits, a load line is a line drawn on the current–voltage characteristic graph for a nonlinear device like a diode or transistor. It represents the constraint put on the voltage and current in the nonlinear device by the external circuit.

  9. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    Because the mirror keeps rotating while the light travels to the distant mirror and back, the light is reflected from the rotating mirror at a different angle on its way out than it is on its way back. From this difference in angle, the known speed of rotation and the distance to the distant mirror the speed of light may be calculated. [106]