Definition: Effulgence is a term used in astronomy to describe the appearance of light or other forms of radiation that are emitted from the surface of a planet, moon, or celestial body. It can be described as a phenomenon where the light or other radiation appears brighter and more intense than what would normally be expected under normal conditions.
Ephelgence is characterized by the presence of a spectrum of colors, including blue, green, red, orange, and yellow, which are typically visible to the naked eye
effulgence