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  2. Sundial - Wikipedia

    en.wikipedia.org/wiki/Sundial

    An easy way to do this is to set a clock or watch so it shows "sundial time" [b] which is standard time, [c] plus the equation of time on the day in question. [ d ] The hour-lines on the sundial are marked to show the positions of the shadow of the style when this clock shows whole numbers of hours, and are labelled with these numbers of hours.

  3. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    The area of a regular polygon is half its perimeter multiplied by the distance from its center to its sides, and because the sequence tends to a circle, the corresponding formula–that the area is half the circumference times the radius–namely, A = ⁠ 1 2 ⁠ × 2πr × r, holds for a circle.

  4. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    A board foot is a United States and Canadian unit of approximate volume, used for lumber. It is equivalent to 1 inch × 1 foot × 1 foot (144 cu in or 2,360 cm 3). It is also found in the unit of density pounds per board foot. In Australia and New Zealand the terms super foot or superficial foot were formerly used for this unit. The exact ...

  5. Notre-Dame de Paris - Wikipedia

    en.wikipedia.org/wiki/Notre-Dame_de_Paris

    Between 1812 and 1813, the clock and bells were moved to the north tower. A 1.34-metre (4.4 ft) clock face was installed inside the church below the organ platform. [147] During Viollet-le-Duc's restoration in the 19th century, a new clock was made.

  6. Ancient Egyptian units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Egyptian_units_of...

    A 36 square cubit area was known as a kalamos and a 144 square cubit area as a hamma. [17] The uncommon bikos may have been 1 + 1 ⁄ 2 hammata or another name for the cubit strip. [17] The Coptic shipa (ϣⲓⲡⲁ) was a land unit of uncertain value, possibly derived from Nubia. [43]

  7. Hourglass - Wikipedia

    en.wikipedia.org/wiki/Hourglass

    A winged hourglass as a literal depiction of the Latin phrase tempus fugit ("time flies") An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb ...

  8. Display size - Wikipedia

    en.wikipedia.org/wiki/Display_size

    Display size. On 2D displays, such as computer monitors and TVs, the display size or viewable image size ( VIS) is the physical size of the area where pictures and videos are displayed. The size of a screen is usually described by the length of its diagonal, which is the distance between opposite corners, usually in inches.

  9. Measurement of a Circle - Wikipedia

    en.wikipedia.org/wiki/Measurement_of_a_Circle

    A page from Archimedes' Measurement of a Circle. Measurement of a Circle or Dimension of the Circle (Greek: Κύκλου μέτρησις, Kuklou metrēsis) [1] is a treatise that consists of three propositions, probably made by Archimedes, ca. 250 BCE. [2] [3] The treatise is only a fraction of what was a longer work. [4] [5]

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