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  2. Equator - Wikipedia

    en.wikipedia.org/wiki/Equator

    The equator passes through the land of eleven sovereign states. Indonesia is the country straddling the greatest length of the equatorial line across both land and sea. Starting at the Prime Meridian and heading eastwards, the equator passes through:

  3. 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.

  4. Longitude - Wikipedia

    en.wikipedia.org/wiki/Longitude

    A geographical mile is defined to be the length of one minute of arc along the equator (one equatorial minute of longitude) therefore a degree of longitude along the equator is exactly 60 geographical miles or 111.3 kilometers, as there are 60 minutes in a degree. The length of 1 minute of longitude along the equator is 1 geographical mile or 1 ...

  5. Glossary of geography terms (A–M) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geography_terms...

    Together, a meridian and its antimeridian form a great circle that passes through the geographic poles. 2. The 180th meridian in particular, i.e. the meridian of longitude that is exactly 180 degrees both east and west of the Prime Meridian, with which it forms a great circle dividing the Earth into the Eastern and Western Hemispheres.

  6. File : Morse Code Mnemonic chart from Girl Guides handbook ...

    en.wikipedia.org/wiki/File:Morse_Code_Mnemonic...

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  7. List of mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_mnemonics

    THE PLAZA PAD is another mnemonic for the first 11 (and most important) Ionian philosophers: Thales, Heraclitus, Empedocles, Protagoras, Leucippus, Anaximander, Zeno, Anaximenes, Parmenides, Anaxagoras, Democritus. SPA is a mnemonic for the philosophers Socrates, Plato, and Aristotle in their order of appearance, Socrates first.

  8. 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 ...

  9. World map - Wikipedia

    en.wikipedia.org/wiki/World_map

    Early world maps cover depictions of the world from the Iron Age to the Age of Discovery and the emergence of modern geography during the early modern period.Old maps provide information about places that were known in past times, as well as the philosophical and cultural basis of the map, which were often much different from modern cartography.