Empirical Earth · Space, Satellites & the Edges of the Map

LAGEOS — bouncing lasers off a satellite to weigh the spinning Earth

The claim

“Satellites aren’t real, and you can’t prove Earth’s shape or spin from the ground.”

What is true

Nobody can inspect a satellite. They are taken on trust by everyone who is not operating one.

What is measured

Lasers ranged off geodetic satellites measure frame-dragging, spacetime twisted by Earth’s spin. As of 2026 the LARES-2 result has that measurement to about one part in a thousand, matching Einstein. You do not drag spacetime with a stationary plane.

What would show this is wrong

a mechanism, of any kind, by which a balloon, a drone, an aircraft or a projection returns a timed laser echo from a fixed orbit for fifty years while carrying no power source, no engine and no electronics; or a terrestrial reference frame that reproduces the same millimeter-level coordinates without ranging on anything in orbit.

Sources

  1. LAGEOS & satellite laser ranging. LAGEOS-1 (1976) and LAGEOS-2 (1992) are passive ~60 cm spheres covered in 426 corner-cube retroreflectors, laser-ranged to mm; their orbits measure Earth's link
  2. LAGEOS, plate tectonics and the reference frame. Satellite laser ranging to the passive LAGEOS spheres (1976, 1992) reaches centimeter-to-millimeter accuracy — enough to measure tectonic pla link
  3. LAGEOS: a passive metal sphere with no electronics at all. LAGEOS-1, launched 4 May 1976, is a sphere 60 cm in diameter weighing 411 kg, consisting of a cylindrical brass core surrounded by link
  4. LAGEOS defines the terrestrial reference frame. The International Laser Ranging Service records that the combination of the two LAGEOS satellites “provided the foundation for the SLR contrib link
  5. LARES-2 measures Earth’s frame-dragging to one part in a thousand (2026). Ciufolini, Paolozzi, Pavlis et al., combining the LARES-2 satellite (launched by the Italian Space Agency in 2022 to link
The full entry, with the working →

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