Twinkling

Twinkling, also called scintillation, is a generic term for variations in the apparent brightness, colour, or position of a distant luminous object viewed through a medium. When the object lies outside Earth's atmosphere, as with stars and planets, the effect is called astronomical scintillation; for objects within the atmosphere it is called terrestrial scintillation. Atmospheric scintillation, defined as variation in illuminance only, is one of the three principal factors governing astronomical seeing. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/