Nardoqan
Nardoqan or Nardugan (Kazakh: Нартуған, [nɑrto̙wˈɣɑn], Turkish: Nardoğan, Azerbaijani: Narduqan, Bashkir: Нардуған) was a Turkic holiday concept in Tengriism. Nowadays, it is most commonly used to refer to the winter solstice in many Central Asian and Siberian languages.