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  2. Earth's circumference - Wikipedia

    en.wikipedia.org/wiki/Earth's_circumference

    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] Treating the Earth as a sphere, its circumference would be its single most important measurement. [2]

  3. String girdling Earth - Wikipedia

    en.wikipedia.org/wiki/String_girdling_Earth

    The answer is that a cat will easily pass through the gap, the size of which will be ⁠ 1 / 2 π ⁠ metres or about 16 cm (6.3 in). Even more surprising is that the size of the sphere or circle around which the string is spanned is irrelevant, and may be anything from the size of an atom to the Milky Way — the result depends only on the ...

  4. Earth radius - Wikipedia

    en.wikipedia.org/wiki/Earth_radius

    Earth radius (denoted as R 🜨 or R E) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).

  5. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...

  6. Orders of magnitude (length) - Wikipedia

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

    To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimeters; 1 cm – 0.39 inches; 1 cm – edge of a square of area 1 cm 2; 1 cm – edge of a cube of volume 1 mL; 1 cm – length of a coffee bean; 1 cm – approximate width of average fingernail

  7. List of islands by area - Wikipedia

    en.wikipedia.org/wiki/List_of_islands_by_area

    This list includes all islands in the world larger than 1,000 km 2 (390 sq mi). For size and location reference, the four continental landmasses are also shown. Continental landmasses Continental landmasses are not usually classified as islands despite being completely surrounded by water. [Note 1] However, because the definition of continent varies between geographers, the Americas are ...

  8. Angular diameter - Wikipedia

    en.wikipedia.org/wiki/Angular_diameter

    an object of diameter 725.27 km at a distance of 1 astronomical unit (AU) an object of diameter 45 866 916 km at 1 light-year; an object of diameter 1 AU (149 597 871 km) at a distance of 1 parsec (pc) Thus, the angular diameter of Earth's orbit around the Sun as viewed from a distance of 1 pc is 2″, as 1 AU is the mean radius of Earth's orbit.

  9. 34th parallel north - Wikipedia

    en.wikipedia.org/wiki/34th_parallel_north

    1 Around the world. 2 See also. 3 References. Toggle the table of contents. 34th parallel north. ... Jiangsu − for about 5 km (3.1 mi) Anhui − for about 4 km (2.5 mi)

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