When was geocentrism disproved?

Geocentrism has never been disproved. No physical experiment has ever detected the Earth's motion or demonstrated that the Sun is stationary. Every claim of "disproof," from Galileo's telescopic observations to modern cosmology, depends on theoretical interpretation rather than direct measurement. When experiments were finally performed to detect the Earth's motion, such as Foucault's pendulum, stellar aberration, and the Michelson-Morley interferometer, they yielded ambiguous or null results, which forced scientists to adopt auxiliary hypotheses. Each of those hypotheses preserved the phenomena only by assuming, not proving, heliocentrism. Einstein's theory of relativity (1905-1915) completed the circle by declaring that no experiment can determine which body is truly at rest. The frame in which the Earth stands fixed and the cosmos moves is as valid as any other. Geocentrism, therefore, was never refuted scientifically. It was abandoned philosophically. (Galileo Was Wrong, Vol. 2, chs. 9-11; Geocentrism 101, ch. 4.) To speak of geocentrism being "disproved" presumes that heliocentrism has produced decisive, unambiguous empirical evidence of the Earth's motion. History shows the opposite. Galileo's observations in the early 1600s were the first supposed challenge: the phases of Venus, the moons of Jupiter, and the irregularities of planetary brightness. Yet each could be explained within Tycho Brahe's geo-heliocentric model, in which the planets orbit the sun while the sun orbits an immobile Earth. This hybrid system matched observation as precisely as Copernicus's did. (GWW, Vol. 1, pp. 201-219.) The decisive experiment Galileo promised, detecting stellar parallax, failed repeatedly. The parallax was not observed until the mid-1800s, long after heliocentrism had already been accepted philosophically. Even then, the effect can be read as the stars moving minutely against a fixed Earth, since the observation alone does not specify which body is in motion. The same mathematical data fit either frame of reference. When physics matured, geocentrism was expected to fall by experimental demonstration. In 1729, James Bradley discovered stellar aberration, a small angular shift of starlight. It was proclaimed as proof of the Earth's orbital velocity. But aberration depends on the relative motion between observer and light source; whether the observer moves or the stars move makes no measurable difference. The same geometry holds in either case. (Geocentrism 101, pp. 66-69.) The nineteenth-century optical experiments were the real test. If the Earth orbits the Sun at 30 km/s, a shift in light's interference fringes should appear. Michelson and Morley (1887) found none. The Earth appeared motionless with respect to the supposed "aether." Rather than accept this as confirmation of geocentrism, physicists invented the Lorentz contraction, a purely theoretical shrinking of space, to preserve heliocentrism. Later, Einstein dispensed with the aether altogether, declaring that all motion is relative. By doing so, he removed the possibility of detecting absolute motion by any means. The result is logical parity between a stationary Earth and a stationary Sun. (GWW, Vol. 2, pp. 305-332.) Further experiments, Michelson-Gale (1925), Sagnac (1913), and Airy's failure (1871), all confirmed the same physical reality: motion is relative, and the measurable rotation of the heavens can as easily be attributed to the universe as to the Earth. Airy's test, for example, found that when a telescope was filled with water to slow light, the expected shift for a moving Earth vanished. His conclusion was that the simplest explanation is that the stars move daily around the Earth. Relativity's mathematical framework now permits any coordinate origin. If the Earth is chosen as the reference point, all cosmic motions transform accordingly, and the equations remain valid. Modern cosmology even reveals an unexpected empirical clue: the alignment of the cosmic microwave background dipole with the Earth's equator and ecliptic plane. This "axis of evil," discovered by the WMAP and Planck satellites, coincides closely with the orientation expected in a geocentric model. (GWW, Vol. 3, ch. 12.) In sum, geocentrism has never been experimentally falsified. Every so-called proof assumes what it intends to demonstrate. Relativity, meant to end the debate, has instead vindicated the fundamental claim: any point in the universe, including Earth, may legitimately be regarded as the center. The difference is no longer physical but philosophical, between a cosmos centered on man under God, and a cosmos without center, meaning, or purpose.