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Equation 68 · Part 2 · The Bend an Elevator Cannot Fake

Symbol Δ t

s=Δt/T≈4.1×10−10s = \Delta t/T \approx 4.1\times10^{-10}
Δt\Delta t

What this part means

Δ t is one of the signed contributions combined to compute the quantity on the left.

Its job in the formula

Δ t is one of the signed contributions combined to compute the quantity on the left.

The passage around this formula

…where the projected area onto Earth’s equatorial plane is close to the full value. With Earth’s sidereal rotation rate Ω\Omega ≈\approx 7.292×\times10^{-5}\,rad s−1\mathrm{rad\,s^{-1}} [ 10 ] , the accumulated timing offset is Δ\Delta t = 2Ω\Omega A/c2c^2 ≈\approx 2(7.292×\times10^{-5})(2.5×\times10^{11})/(8.988×\times10^{16}) ≈\approx 4.1×\times10^{-10}\,s\mathrm s , a little over four hundred picoseconds. Gated at the one-second averaging interval conventional for this comparison, the corresponding dimensionless edge bias is s =…

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A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

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Sources cited in the surrounding passage

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