Farsakh (Arabic:الفرسخ) is an old measure of length which is equal to about 5 to 5.5 kilometers. In addition to this measure which is known as Shar'i Farsakh (religious Farsakh), there are other types of Farsakh which were common once such as the Hindi Farsakh which was about 12 km and Farsakh of the time of Qajar and Pahlavi which were about 6 km. Sometimes, Farsakh has also been called Parasang.
Length of Farsakh
Every religious Farsakh equals 3 miles and every mile (according to faqihs (jurisprudents)) equals 4000 Dhira' and the length of every Dhira' is 24 fingers or two handspans of a person. Thus, Farsakh is about 12 thousand Dhira', about 5 to 5.5 kilometers.
Farsakh has had other different measures as well such as Hindi Farsakh which was about 12 km and Farsakh common at Qajar and Pahlavi times which was about 6 km and the Khurasani Farsakh which is twice as big as the common religious Farsakh.
Eight Farsakhs or the Religious Distance for a Passenger
- Main article: Juridical distance
Regarding different opinions of jurisprudents about the approximate equivalent of Farsakh in kilometer, eight Farsakhs which is the religious distance for travel is also different according to their views from 40 to 45 km: 40 km, 43 km, 44 km and 45 km.
- Traveling which causes Qasr of prayer (prayers comprising of four rak'as (units) are reduced into two rak'as) and breaking the fast: passing eight Farsakhs is the way a passenger is considered on travel and with certain conditions causes Qasr of prayer and breaking the fast.
- The distance necessary between holding two separate congregations of Friday prayers: holding Friday prayers in a distance less than one Farsakh from another place where Friday prayer is performed is not permitted.
- Obligation of Friday prayer: providing the obligation of Friday prayer, such as the time of presence of infallible Imam (a) and the power of the Imam (a), Friday prayer is not obligatory on people whose distance with the place of Friday prayer is more than two Farsakhs.
- The material for this article is mainly taken from فرسخ شرعی in Farsi WikiShia.