The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of "reconciliation of a...

The Schrödinger equation is a linear partial differential equation that governs the wave function of a quantum-mechanical system.: 1–2  Its discovery was...

theory, Kolmogorov equations, including Kolmogorov forward equations and Kolmogorov backward equations, characterize continuous-time Markov processes....

correction—which may be as great as 16 minutes, 33 seconds—is described by the equation of time. A sophisticated sundial, with a curved style or hour lines, may incorporate...

heat equation is a certain partial differential equation. Solutions of the heat equation are sometimes known as caloric functions. The theory of the heat...

GMT, a discrepancy described by the equation of time. Noon GMT is the annual average (the arithmetic mean) moment of this event, which accounts for the...

equation or sunset equation can be used to derive the time of sunrise or sunset for any solar declination and latitude in terms of local solar time when...

equations are used to describe the time evolution of a system that can be modeled as being in a probabilistic combination of states at any given time...

Schrödinger equation containing only the 36 coordinates of the nuclei. So, taking the most optimistic estimate for the complexity, instead of a large equation requiring...

clock. Since the main effect of this oscillation concerns time, it is called the equation of time, using the word "equation" in a somewhat archaic sense...