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e. The 15-minute city ( FMC[ 2] or 15mC[ 3]) is an urban planning concept in which most daily necessities and services, such as work, shopping, education, healthcare, and leisure can be easily reached by a 15-minute walk, bike ride, or public transit ride from any point in the city. [ 4] This approach aims to reduce car dependency, promote ...
Definition. The degree of curvature is defined as the central angle to the ends of an agreed length of either an arc or a chord; [ 1] various lengths are commonly used in different areas of practice. This angle is also the change in forward direction as that portion of the curve is traveled. In an n -degree curve, the forward bearing changes by ...
The Camden Yards-Penn Station route sees 30-minute headways at all times. Because there is significant overlap on these routes, most of the system sees 10-minute peak and 15-minute off-peak headways; stations in the downtown section between Mt. Royal and Camden Yards are served by six trains an hour off-peak and eight trains an hour at peak.
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Geodesy. Earth's circumference is the distance around Earth. Measured around the equator, it is 40,075.017 km (24,901.461 mi). Measured passing through the poles, the circumference is 40,007.863 km (24,859.734 mi). [ 1] Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific ...
A minute of arc is π 10 800 of a radian . A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, [2] is 1 60 of an arcminute, 1 3600 of a degree, [1] 1 1 296 000 of a turn, and π 648 000 (about 1 206 264.8) of a radian. These units originated in Babylonian astronomy as ...
A differential wheeled robot is a mobile robot whose movement is based on two separately driven wheels placed on either side of the robot body. It can thus change its direction by varying the relative rate of rotation of its wheels and hence does not require an additional steering motion. Robots with such a drive typically have one or more ...
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