👉 Chromatics, in the context of astronomy and astrophysics, refers to a series of colors or hues that are used to describe the spectrum of light emitted from celestial objects. These colors include red, orange, yellow, green, blue, indigo, and violet, each representing a different wavelength of electromagnetic radiation. The term "chromatics" was first used by astronomer William Herschel in his 1830 work "Catalogus Astro-Geographiae" (H