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The 38th parallel north is a circle of latitude that is 38 degrees north of the Earth's equatorial plane.It crosses Europe, the Mediterranean Sea, Asia, the Pacific Ocean, North America, and the Atlantic Ocean.
Two levels of abstraction are employed in the definitions of latitude and longitude. In the first step the physical surface is modeled by the geoid, a surface which approximates the mean sea level over the oceans and its continuation under the land masses.
A brief history of geodesy from NASA. [1]The history of geodesy (/dʒiːˈɒdɪsi/) began during antiquity and ultimately blossomed during the Age of Enlightenment.. Many early conceptions of the Earth held it to be flat, with the heavens being a physical dome spanning over it.
Historical Hilgenberg globes [1] Potential reconstruction of continents bordering the Atlantic (left column) and Pacific (right column) oceans as they might have appeared at different points, going back in history, using the expanding Earth hypothesis, based on reconstructions by expanding Earth proponent Neal Adams
Earth's atmosphere photographed from the International Space Station.The orange and green line of airglow is at roughly the altitude of the Kármán line. [1]The Kármán line (or von Kármán line / v ɒ n ˈ k ɑːr m ɑː n /) [2] is a conventional definition of the edge of space; it is widely but not universally accepted.
The Nazca lines (/ ˈ n ɑː z k ə /, /-k ɑː / [1]) are a group of over 700 geoglyphs made in the soil of the Nazca Desert in southern Peru. [2] [3] They were created between 500 BC and 500 AD by people making depressions or shallow incisions in the desert floor, removing pebbles and leaving different-colored dirt exposed. [4]
Satellite image of a fault in the Taklamakan Desert.The two colorful ridges (at bottom left and top right) used to form a single continuous line, but have been split apart by movement along the fault.
The meridian on the celestial sphere. An observer's upper meridian, a semicircle contains their zenith and both celestial poles; the observer's local meridian is the semicircle that passes through their zenith and the north and south points of their horizon.