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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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<blockquote data-quote="Mikecr" data-source="post: 2538013" data-attributes="member: 1521"><p>This statement here: "<em>Gravity is proportional to your elevation. It is decreasing as you move away from the center of the earth. The force of gravity is reduced by 1/R^2 where R represents your distance from the center of the earth" </em>is a generalization, which does not hold true for us.</p><p>Earth is not uniform in density but changes in density with topography. With this, gravity is a local affect, with center of gravity changing from position to position. So if you reached 5000'ASL by standing on a rocky mountain, gravity would likely be a little higher there, due to higher density of the mountain, even while further from Earth's center.</p><p>A gyro stabilized platform, which normally points to near center of Earth, will tilt toward a mountain as you pass by it.</p><p></p><p>Since it's tiny and we have no way to practically measure it while hunting, we dismiss the variance.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2538013, member: 1521"] This statement here: "[I]Gravity is proportional to your elevation. It is decreasing as you move away from the center of the earth. The force of gravity is reduced by 1/R^2 where R represents your distance from the center of the earth" [/I]is a generalization, which does not hold true for us. Earth is not uniform in density but changes in density with topography. With this, gravity is a local affect, with center of gravity changing from position to position. So if you reached 5000'ASL by standing on a rocky mountain, gravity would likely be a little higher there, due to higher density of the mountain, even while further from Earth's center. A gyro stabilized platform, which normally points to near center of Earth, will tilt toward a mountain as you pass by it. Since it's tiny and we have no way to practically measure it while hunting, we dismiss the variance. [/QUOTE]
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Altitude vs. Barometric pressure
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