Editing Leap year (section)

==Baháʼí calendar==
{{main | Baháʼí calendar }}
The Baháʼí calendar is a solar calendar composed of 19 months of 19&nbsp;days each (361&nbsp;days). Years begin at Naw-Rúz, on the [[vernal equinox (Northern Hemisphere)|vernal equinox]], on or about 21 March. A period of intercalary days, called [[Ayyam-i-Ha]], is inserted before the 19th month. This period normally has four&nbsp;days, but an extra day is added when needed to ensure that the following year starts on the [[vernal equinox (Northern Hemisphere)|vernal equinox]]. This is calculated and known years in advance.