Now we are looking on the crossword clue for: At this point land appears.
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Possible Answers:
sea level.
Last seen on: The Sun – Two Speed Crossword – Jan 6 2019
Random information on the term “sea level”:
In geodesy, a reference ellipsoid is a mathematically defined surface that approximates the geoid, the truer figure of the Earth, or other planetary body.Because of their relative simplicity, reference ellipsoids are used as a preferred surface on which geodetic network computations are performed and point coordinates such as latitude, longitude, and elevation are defined.
In the context of standardization and geographic applications, a geodesic reference ellipsoid is the mathematical model used as foundation by Spatial reference system or Geodetic datum definitions.
In 1687 Isaac Newton published the Principia in which he included a proof[1][not in citation given] that a rotating self-gravitating fluid body in equilibrium takes the form of an oblate ellipsoid of revolution which he termed an oblate spheroid. Current practice[2][3] uses the word ‘ellipsoid’ alone in preference to the full term ‘oblate ellipsoid of revolution’ or the older term ‘oblate spheroid’. In the rare instances (some asteroids and planets) where a more general ellipsoid shape is required as a model the term used is triaxial (or scalene) ellipsoid. A great many ellipsoids have been used with various sizes and centres but modern (post-GPS) ellipsoids are centred at the actual center of mass of the Earth or body being modeled.