The term "Khoya Khoya Chand" does not correspond to a widely recognized or established concept, entity, or academic subject in reliable encyclopedic sources.
"Khoya Khoya Chand" appears to be a phrase in Urdu/Hindi, translating literally to "Lost or Faded Moon" ("Khoya" meaning lost or vanished, "Chand" meaning moon). It may be used poetically or metaphorically in literature, music, or film to evoke melancholy, nostalgia, or romantic imagery.
There is a possibility that the phrase is associated with artistic works. For example, a similarly titled Bollywood song "Khoya Khoya Chand" was featured in the 2005 film Lakshya, composed by Rahul Sharma and lyrically inspired by classic Hindi cinema. However, as a standalone term, "Khoya Khoya Chand" does not denote a specific entity such as a historical event, scientific phenomenon, or cultural institution.
Accurate information is not confirmed regarding "Khoya Khoya Chand" as an independent concept. Its usage appears contextual and primarily artistic or poetic in nature.