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  2. Geography (Ptolemy) - Wikipedia

    en.wikipedia.org/wiki/Geography_(Ptolemy)

    At that time, in the court of the caliph al-Maʾmūm, al-Khwārazmī compiled his Book of the Depiction of the Earth (Kitab Surat al-Ard) which mimicked the Geography [40] in providing the coordinates for 545 cities and regional maps of the Nile, the Island of the Jewel, the Sea of Darkness, and the Sea of Azov. [40]

  3. Ptolemy's world map - Wikipedia

    en.wikipedia.org/wiki/Ptolemy's_world_map

    The Ptolemy world map is a map of the world known to Greco-Roman societies in the 2nd century. It is based on the description contained in Ptolemy 's book Geography , written c. 150 . Based on an inscription in several of the earliest surviving manuscripts, it is traditionally credited to Agathodaemon of Alexandria .

  4. History of geodesy - Wikipedia

    en.wikipedia.org/wiki/History_of_geodesy

    The monk Bede (c. 672–735) wrote in his influential treatise on computus, The Reckoning of Time, that Earth was round. He explained the unequal length of daylight from "the roundness of the Earth, for not without reason is it called 'the orb of the world' on the pages of Holy Scripture and of ordinary literature.

  5. Geologic time scale - Wikipedia

    en.wikipedia.org/wiki/Geologic_time_scale

    The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [3] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...

  6. Early world maps - Wikipedia

    en.wikipedia.org/wiki/Early_world_maps

    'A Map of the Myriad Countries of the World'; Italian: Carta Geografica Completa di tutti i Regni del Mondo, "Complete Geographical Map of all the Kingdoms of the World"), printed by Italian Jesuit missionary Matteo Ricci at the request by Wanli Emperor in 1602, is the first known European-styled Chinese world map (and the first Chinese map to ...

  7. History of longitude - Wikipedia

    en.wikipedia.org/wiki/History_of_longitude

    But the method is sound, and this is the first recognition that longitude can be determined by accurate knowledge of time. Ptolemy's map of the Mediterranean superimposed on a modern map, with Greenwich as the reference longitude. Ptolemy, in the 2nd century AD, based his mapping system on estimated distances and directions reported by ...

  8. The time when a day on Earth was just 19 hours long - AOL

    www.aol.com/lifestyle/day-earth-used-just-19...

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  9. Ptolemaic Kingdom - Wikipedia

    en.wikipedia.org/wiki/Ptolemaic_Kingdom

    By Ptolemy XII's time, Rome had achieved a massive amount of influence over Egyptian politics and finances to the point that he declared the Roman senate the guardian of the Ptolemaic Dynasty. He had paid vast sums of Egyptian wealth and resources in tribute to the Romans in order to regain and secure his throne following the rebellion and ...