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  2. Decimal degrees - Wikipedia

    en.wikipedia.org/wiki/Decimal_degrees

    The equator is divided into 360 degrees of longitude, so each degree at the equator represents 111,319.5 metres (365,221 ft). As one moves away from the equator towards a pole, however, one degree of longitude is multiplied by the cosine of the latitude, decreasing the distance, approaching zero at the pole.

  3. Latitude - Wikipedia

    en.wikipedia.org/wiki/Latitude

    With this value for R the meridian length of 1 degree of latitude on the sphere is 111.2 km (69.1 statute miles) (60.0 nautical miles). The length of one minute of latitude is 1.853 km (1.151 statute miles) (1.00 nautical miles), while the length of 1 second of latitude is 30.8 m or 101 feet (see nautical mile).

  4. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    M: Ratio of the speed to the speed of sound [note 1] in the medium (unitless). ≈ 340 m/s in air at sea level ≈ 295 m/s in air at jet altitudes metre per second (SI unit) m/s ≡ 1 m/s = 1 m/s mile per hour: mph ≡ 1 mi/h = 0.447 04 m/s: mile per minute: mpm ≡ 1 mi/min = 26.8224 m/s: mile per second: mps ≡ 1 mi/s = 1 609.344 m/s

  5. Wikipedia : WikiProject Geographical coordinates

    en.wikipedia.org/wiki/Wikipedia:WikiProject...

    Degrees, minutes and seconds, when used, must each be separated by a pipe ("|"). Map datum must be WGS84 if possible (except for off-Earth bodies). Avoid excessive precision (0.0001° is <11 m, 1″ is <31 m). Maintain consistency of decimal places or minutes/seconds between latitude and longitude. Latitude (N/S) must appear before longitude (E/W).

  6. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    Since one degree is ⁠ 1 / 360 ⁠ of a turn, or complete rotation, one arcminute is ⁠ 1 / 21 600 ⁠ of a turn. The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on a spherical Earth, so the actual Earth's circumference is very near 21 600 nmi. A minute of arc is ⁠ π / 10 800 ⁠ of a radian.

  7. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    Length (m): The length of the equator is close to 40 000 000 m (more precisely 40 075 014.2 m). [23] In fact, the dimensions of our planet were used by the French Academy in the original definition of the metre; [ 24 ] most dining tabletops are about 0.75 metres high; [ 25 ] a very tall human (basketball forward) is about 2 metres tall.

  8. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The micrometre (SI symbol: μm) is a unit of length in the metric system equal to 10 −6 metres (⁠ 1 / 1 000 000 ⁠ m = 0. 000 001 m). To help compare different orders of magnitude , this section lists some items with lengths between 10 −6 and 10 −5 m (between 1 and 10 micrometers , or μm).

  9. Meridian arc - Wikipedia

    en.wikipedia.org/wiki/Meridian_arc

    where φ (°) = ⁠ φ / 1° ⁠ is φ expressed in degrees (and similarly for β (°)). On the ellipsoid the exact distance between parallels at φ 1 and φ 2 is m(φ 1) − m(φ 2). For WGS84 an approximate expression for the distance Δm between the two parallels at ±0.5° from the circle at latitude φ is given by