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  2. Arrowhead - Wikipedia

    en.wikipedia.org/wiki/Arrowhead

    The arrowhead or projectile point is the primary functional part of the arrow, and plays the largest role in determining its purpose. Some arrows may simply use a sharpened tip of the solid shaft, but it is far more common for separate arrowheads to be made, usually from metal, horn, rock, or some other hard material.

  3. Polar alignment - Wikipedia

    en.wikipedia.org/wiki/Polar_alignment

    In the Northern Hemisphere, rough alignment can be done by visually aligning the axis of the telescope mount with Polaris.In the Southern hemisphere or places where Polaris is not visible, a rough alignment can be performed by ensuring the mount is level, adjusting the latitude adjustment pointer to match the observer's latitude, and aligning the axis of the mount with true south or north by ...

  4. Universal Electronic Test Chart - Wikipedia

    en.wikipedia.org/.../Universal_Electronic_Test_Chart

    They are formed by bursts of sinusoidal signals with frequencies of 2, 3, 4 and 5 MHz, corresponding to resolutions of 220, 330, 440 and 550 horizontal TV lines; [22] Black and white squares - alternating squares at line 16, to evaluate the frequency response of the video chain;

  5. Setting circles - Wikipedia

    en.wikipedia.org/wiki/Setting_circles

    The term Right Ascension took its name from early northern hemisphere observers for whom "ascending stars" were on the east or right hand side. In the southern hemisphere the east is on the left when an equatorial mount is aligned on the south pole. Many Right Ascension setting circles therefore carry two sets of numbers, one showing the value ...

  6. BICEP and Keck Array - Wikipedia

    en.wikipedia.org/wiki/BICEP_and_Keck_Array

    Immediately next to the BICEP telescope at the Martin A. Pomerantz Observatory building at the South Pole was an unused telescope mount previously occupied by the Degree Angular Scale Interferometer. [28] The Keck Array was built to take advantage of this larger telescope mount.

  7. Pole figure - Wikipedia

    en.wikipedia.org/wiki/Pole_figure

    It is possible to choose any projection plane parallel to the equator (except the South pole): the figures will be proportional (property of similar triangles). It is usual to place the projection plane at the North pole. Definition The pole figure is the stereographic projection of the poles used to represent the orientation of an object in space.

  8. B4-mount - Wikipedia

    en.wikipedia.org/wiki/B4-mount

    The B4 mount defines the sensor to have a diagonal size of 11 mm (a so-called 2/3" size sensor). The B4-mount is used by practically all 2/3" broadcast lenses and cameras (as of 2019). Although the standard was set in 1992, the B4 mount already existed before 1980. The Sony BVP-300, produced from 1978, was possibly the first camera with a B4 mount.

  9. Amundsen–Scott South Pole Station - Wikipedia

    en.wikipedia.org/wiki/Amundsen–Scott_South_Pole...

    The 2017 novel South Pole Station by Ashley Shelby is set at the Amundsen-Scott South Pole station of 2002-2003, prior to the opening of the new facility. The 2019 film Where'd You Go, Bernadette features the station prominently and includes scenes of its construction at the closing credits, although the actual station depicted in the film is ...