 "Salat ul-Kusuf" () is a prayer offered during a solar eclipse; "Salat ul-Khusuf" () is performed during a lunar eclipse.They are both Nafl (non-obligatory) with two rakat prayers that should be performed by the Muslim community in congregation.Two or four Rakat (Units) of Khusuf salah are offered in a Jama'ah (Group) or individually, with individual prayers preferred.