A cikin kalandar wata, watan tsalle shine ƙarin wata da aka ƙara a kalandar don kiyaye kalandar wata da shekarar rana.Kalandar wata ta dogara ne akan zagayowar wata, wanda ya kai kimanin kwanaki 29.5, don haka shekarar wata tana da tsawon kwanaki 354.Wannan ya gajarta fiye da shekarar hasken rana, wanda ke kusan kwanaki 365.24.
Don kiyaye kalandar wata daidai da shekarar rana, ana ƙara ƙarin wata a kalandar wata kusan kowace shekara uku.Ana shigar da watan tsalle ne bayan wani wata a cikin kalandar wata, kuma ana sanya shi suna iri ɗaya da wannan watan, amma tare da sunan “tsalle” a cikinsa.Misali, watan tsallen da aka kara bayan wata na uku ana kiransa “leap three month” ko “intercalary three month”.Hakanan ana lissafin watan tsalle a matsayin wata na yau da kullun, kuma ana gudanar da duk bukukuwa da bukukuwan da ke faruwa a wannan watan kamar yadda aka saba.
Bukatar wata tsalle a kalandar wata ta taso ne saboda zagayowar wata da zagayowar rana ba su daidaita daidai ba.Ƙara watan tsalle yana tabbatar da cewa kalandar wata ta kasance daidai da yanayi, da kuma kalandar rana.
Lokacin aikawa: Maris 23-2023