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...

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...

An equation clock is a mechanical clock which includes a mechanism that simulates the equation of time, so that the user can read or calculate solar time...

Functional equation Functional equation (L-function) Constitutive equation Laws of science Defining equation (physical chemistry) List of equations in classical...

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...

A continuity equation or transport equation is an equation that describes the transport of some quantity. It is particularly simple and powerful when...

The wave equation is a second-order linear partial differential equation for the description of waves or standing wave fields such as mechanical waves...

In mathematics, time-scale calculus is a unification of the theory of difference equations with that of differential equations, unifying integral and differential...

equation, a symbolic representation of a chemical reaction Equation of time, the difference between solar time, as shown by a sundial, and mean time,...

mean time and local apparent time is the equation of time. Local mean time was used from the early 19th century, when local solar time or sundial time was...

problems, the analogous equation is a partial differential equation that is called the Hamilton–Jacobi–Bellman equation. In discrete time any multi-stage optimization...

Fokker–Planck equation is a partial differential equation that describes the time evolution of the probability density function of the velocity of a particle...

Globes of Earth often display an analemma as a two-dimensional figure of equation of time vs. declination of the Sun. The north–south component of the analemma...

rates of change, and the differential equation defines a relationship between the two. Such relations are common; therefore, differential equations play...

The Navier–Stokes equations (/nævˈjeɪ stoʊks/ nav-YAY STOHKS) are partial differential equations which describe the motion of viscous fluid substances...

The convection–diffusion equation is a combination of the diffusion and convection (advection) equations, and describes physical phenomena where particles...

mean time is ahead of apparent time by about 14 minutes near February 6, and behind apparent time by about 16 minutes near November 3. The equation of time...

In physics, equations of motion are equations that describe the behavior of a physical system in terms of its motion as a function of time. More specifically...

called Poisson's equation, a generalization of Laplace's equation. Laplace's equation and Poisson's equation are the simplest examples of elliptic partial...

differential equations (PDEs) in both space and time. The Helmholtz equation, which represents a time-independent form of the wave equation, results from...

ordinary differential equations are methods used to find numerical approximations to the solutions of ordinary differential equations (ODEs). Their use is...

Hamilton-Jacobi-Bellman (HJB) equation is a nonlinear partial differential equation that provides necessary and sufficient conditions for optimality of a control with...

pre-corrected for the equation of time on the date of observation, to form local mean solar time. Noon occurred at different times but time differences between...