Planetary phenomena are the movements of planets and the sun, including for example orbits, alignments, eclipses day and night cycles, and the change of seasons.
A stochastic process that describes (among other things) the rapid and chaotic motion of particles suspended in a fluid at rest as a consequence of fluctuations in the rate at which fluid molecules collide with the particles.
In meteorology, the result of radiative cooling of the earth's surface and adjacent air. Radiational cooling occurs, as is typical on calm, clear nights