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  2. Geography of Luxembourg - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Luxembourg

    Trees at Birtrange Castle in Luxembourg. Luxembourg's flora is characterized by the country's location at the border between the Atlantic-European and Central-European climate zones. In the north, beech and oak trees are plentiful. The oak trees can grow up to 30–45 m (98–148 ft), with a diameter of 1.2–2.4 m (3.9–7.9 ft).

  3. Outline of Luxembourg - Wikipedia

    en.wikipedia.org/wiki/Outline_of_Luxembourg

    Luxembourg has a population of half a million people in an area of approximately 2,586 square kilometres (999 sq mi). [2] Luxembourg is a parliamentary representative democracy with a constitutional monarchy, ruled by a Grand Duke. It is the world's only remaining sovereign Grand Duchy.

  4. Earth-centered, Earth-fixed coordinate system - Wikipedia

    en.wikipedia.org/wiki/Earth-centered,_Earth...

    The X axis is in the plane of the equator, passing through the origin and extending from 180° longitude (negative) to the prime meridian (positive); in WGS 84, this is the IERS Reference Meridian. The Y axis is also in the plane of the equator, passing through extending from 90°W longitude (negative) to 90°E longitude (positive)

  5. World Meteorological Organization squares - Wikipedia

    en.wikipedia.org/wiki/World_Meteorological...

    The third and fourth digits (xx00 through xx17) similarly indicate the number of tens of degrees of longitude of the 'minimum' square boundary, nearest to the Prime Meridian. By way of illustration, the square 1000 thus extends from 0°N to 10°N, 0°E to 10°E, and the square 7817 from 80°N to 90°N, 170°W to 180°W, adjacent to the major ...

  6. IERS Reference Meridian - Wikipedia

    en.wikipedia.org/wiki/IERS_Reference_Meridian

    The most important reason for the 5.3 seconds of longitude offset between the IERS Reference Meridian and the Airy transit circle is that the observations with the transit circle were based on the local vertical, while the IERS Reference is a geodetic longitude, that is, the plane of the meridian contains the center of mass of the Earth.

  7. Hemispheres of Earth - Wikipedia

    en.wikipedia.org/wiki/Hemispheres_of_Earth

    The division of Earth by the Equator and the prime meridian Map roughly depicting the Eastern and Western hemispheres. In geography and cartography, hemispheres of Earth are any division of the globe into two equal halves (hemispheres), typically divided into northern and southern halves by the Equator and into western and eastern halves by the Prime meridian.

  8. Meridian (geography) - Wikipedia

    en.wikipedia.org/wiki/Meridian_(geography)

    These two locations often conflicted and a settlement was reached only after there was an International Meridian Conference held, in which Greenwich was recognized as the 0° location. [6] The meridian through Greenwich (inside Greenwich Park), England, called the Prime Meridian, was set at zero degrees of longitude, while other meridians were ...

  9. Prime meridian - Wikipedia

    en.wikipedia.org/wiki/Prime_meridian

    The prime meridian of Mars was established in 1971 [35] and passes through the center of the crater Airy-0, although it is fixed by the longitude of the Viking 1 lander, which is defined to be 47.95137°W. [36] The prime meridian on Ceres runs through the Kait crater, which was arbitrarily chosen because it is near the equator (about 2° south ...