👉 The UTC fluid, or Coordinated Universal Time fluid, is an approximation of the mean solar time that accounts for the irregularities in Earth's rotation, such as variations caused by tidal forces and the planet's slightly ellipsoidal shape. Unlike standard UTC, which is a precise timekeeping standard based on atomic clocks, the UTC fluid adjusts to reflect the actual, variable motion of Earth's rotation. This fluid is used in certain astronomical and geophysical applications where a more flexible time scale is needed to model Earth's dynamic behavior, such as in the study of long-term changes in Earth's rotation rate or in tidal predictions. It essentially represents a "fluid" version of UTC, allowing for more realistic simulations and calculations that incorporate the natural, non-uniform motion of our planet.
