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Geopotential height differs from geometric height (as given by a tape measure) because Earth's gravity is not constant, varying markedly with altitude and latitude; thus, a 1-m geopotential height difference implies a different vertical distance in physical space: "the unit-mass must be lifted higher at the equator than at the pole, if the same ...
For example, at a radius of 6600 km (about 200 km above Earth's surface) J 3 /(J 2 r) is about 0.002; i.e., the correction to the "J 2 force" from the "J 3 term" is in the order of 2 permille. The negative value of J 3 implies that for a point mass in Earth's equatorial plane the gravitational force is tilted slightly towards the south due to ...
Since the atmosphere at a height of approximately 5.5 kilometres (3.4 mi) is mostly divergence-free, the barotropic model best approximates the state of the atmosphere at a geopotential height corresponding to that altitude, which corresponds to the atmosphere's 500 mb (15 inHg) pressure surface. [6]
Geopotential is the potential of the Earth's gravity field. For convenience it is often defined as the negative of the potential energy per unit mass , so that the gravity vector is obtained as the gradient of the geopotential, without the negation.
The equation that relates the two altitudes are (where z is the geometric altitude, h is the geopotential altitude, and r 0 = 6,356,766 m in this model): = Note that the Lapse Rates cited in the table are given as °C per kilometer of geopotential altitude, not geometric altitude.
is the geopotential f {\displaystyle f} is the term corresponding to the Coriolis force , and is equal to 2 Ω sin ( ϕ ) {\displaystyle 2\Omega \sin(\phi )} , where Ω {\displaystyle \Omega } is the angular rotation rate of the Earth ( 2 π / 24 {\displaystyle 2\pi /24} radians per sidereal hour), and ϕ {\displaystyle \phi } is the latitude
Mystery Case Files: Return to Ravenhearst Walkthrough Part 3. Gamezebo. Updated August 10, 2016 at 7:08 PM. ... BOTTOM OF THE WELL-MINI GAME. Click on the door and a puzzle will appear.
The Tracker Component Library from the United States Naval Research Laboratory is a free Matlab library with a number of gravitational synthesis routines. The function getEGMGeoidHeight can be used to evaluate the geoid height under the EGM96 and EGM2008 models.