The9thdayofthe9thlunarmonthisthetraditionalChongyangFestival,orDoubleNinthFestival.ItusuallyfallsinOctoberintheGregoriancalendar.InanancientandmysteriousbookYiJing,orTheBookofChanges,number6wasthoughttobeofYincharacter,meaningfeminineornegative,whilenumber9wasthoughttobeYang,meaningmasculineorpositive.SothenumbernineinbothmonthanddaycreatetheDoubleNinthFestival,orChongyangFestival.ChonginChinesemeansdouble.Also,asdoubleninthwaspronouncedthesameasthewordtosignifyforever,bothareJiuJiu,theChineseancestorsconsidereditanauspiciousdayworthcelebration.That'swhyancientChinesebegantocelebratethisfestivallongtimeago.Thecustomofascendingaheighttoavoidepidemicswaspasseddownfromlongtimeago.Therefore,theDoubleNinthFestivalisalsocalledHeightAscendingFestival.Theheightpeoplewillreachisusuallyamountainoratower.Ancientliteraryfigureshaveleftmanypoemsdepictingtheactivity.Eventoday,peoplestillswarmtofamousorlittleknownmountainsonthisday.