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In geometry, an orthant [1] or hyperoctant [2] is the analogue in n-dimensional Euclidean space of a quadrant in the plane or an octant in three dimensions. In general an orthant in n-dimensions can be considered the intersection of n mutually orthogonal half-spaces. By independent selections of half-space signs, there are 2 n orthants in n ...
A large frame quadrant at the Beijing Ancient Observatory.It was constructed in 1673. A quadrant is an instrument used to measure angles up to 90°.Different versions of this instrument could be used to calculate various readings, such as longitude, latitude, and time of day.
Robert Hooke invented a reflecting quadrant in 1684 [13] and had written about the concept as early as 1666. [14] Hooke's was a single-reflecting instrument. [ 14 ] Other octants were developed by Jean-Paul Fouchy and Caleb Smith in the early 1730s, however, these did not become significant in the history of navigation instruments.
Some instances of the smallest bounding circle. The smallest-circle problem (also known as minimum covering circle problem, bounding circle problem, least bounding circle problem, smallest enclosing circle problem) is a computational geometry problem of computing the smallest circle that contains all of a given set of points in the Euclidean plane.
Galactic quadrant, one out of four circular sectors in the division of the Milky Way galaxy; Quadrant (abdomen), a division of the abdominal cavity; Quadrant (architecture) a curve in a wall or vaulted ceiling of a building; Quadrant (instrument), an angle or time-measuring instrument; Quadrant (semigraphics), a 2×2 semigraphical pixel array ...
Nonius method of measuring an angle with higher precision. The nonius was used to improve the astrolabe's accuracy. This consisted of a number of concentric circles traced on an instrument and dividing each successive one with one fewer divisions than the adjacent outer circle.
A former Allianz fund manager was spared prison time on Friday over his role in a meltdown of private investment funds sparked by the COVID-19 pandemic that caused an estimated $7 billion of ...
The reference ellipsoid is usually defined by its semi-major axis (equatorial radius) and either its semi-minor axis (polar radius) , aspect ratio (/) or flattening, but GRS80 is an exception: four independent constants are required for a complete definition.