EntityQ1225911· pop 34· linked from 349 articlesintercalationSign in to saveinsertion of a leap day, week, or month into some calendar years to make the calendar follow the seasons or moon phasesConnectionsgeologic time scaleEntityleap yearEntitychronometryEntitytime translation symmetryEntityscienceEntityhistoryEntitytimeEntitydayEntityAugustusEntityyearEntitymonthEntityTehranCityweekEntitygeologyEntitytime zoneEntityGregorian calendarEntitycalendar systemEntityAncient EgyptEntityclockEntitycenturyEntityCategoriesCalendarsUnits of time