Michael McMahon Posted September 9 Posted September 9 In spite of being age 29 I struggle to ask any woman out for a date because I can’t fully settle on a confidence level between a welfare applicant and a posthumous noble prize winner! Perhaps I shouldn’t even need a date to marry someone! One way to take Einstein’s relativity theory literally is that we might not be able to distinguish the vertical and horizontal directions apart in absolute space. As such we could theoretically rotate the solar system as moving in the vertical rather than the horizontal direction relative to a perpendicular galaxy. This way the oval shape of the Earth could be viewed as spinning vertically on its elongated axis rather than sideways on its shortened axis. This would better resemble the vertical convectional currents of magma in the Earth’s mantle. It’d then be easier to visualise how you’d be crashing into the Earth’s vertical tilt as you drive to force you to remain at ground level. The Earth might appear to be rotating like a boomerang with an uneven centre of gravity in the vertical direction to perpetually rotate around the Sun. Am I missing something?! Oblate vs vertically oriented prolate spheroid
Michael McMahon Posted September 9 Author Posted September 9 One way to visualise a vertical planetary rotation for gravity is to merely imagine the upright rings of Uranus: “Uranus is different from other planets — its axis of rotation is tilted 98º to the plane of the solar system.“
studiot Posted September 9 Posted September 9 1 hour ago, Michael McMahon said: Am I missing something?! So are you challenging all the geodetic measurements of the last four centuries ? This topic does not belong in Classical Physics ! Please speak to a moderator to get it moved to where it belongs.
Michael McMahon Posted September 9 Author Posted September 9 9 minutes ago, studiot said: So are you challenging all the geodetic measurements of the last four centuries ? This topic does not belong in Classical Physics ! Please speak to a moderator to get it moved to where it belongs. Indeed I’ll have to mimic Copernicus’ deathbed publication on his heliocentric revolution to avoid insults!
Mordred Posted September 9 Posted September 9 None of the above is useful for GR besides the geometry itself. When applying the Lorentz transformations the x coordinate is by convention chosen for the particle momentum. Any orientations are handled via symmetry relations involving rotational and spatial translations. So one can arbitrarily apply GR to any orientation of any object relative to any other orientation. You also mentioned absolute space above. Forget that there is no absolute reference frame or space. How objects behave in the the presence of spacetime curvature has nothing to do with the composition of the mass terms so relating that to magma makes little sense. The composition merely contributes to establishing the mass distribution which in turn leads to the spacetime curvature terms. For oblate spheroids a choice of orientation won't matter as the mass terms is asymmetric and the mass distribution will also be non uniform. This is already handled under the EFE.
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