divided into a series of twelve wulan/sasi or lunar months. Each consists of 29 or 30 days. This is adapted from the use of months in the Islamic calendar...

month is 29.530587981 days. Thus the average lunar year (twelve new moons) is 10.87513 days shorter than the average solar year (365.24219 − (12 × 29.530587981))...

الكريم". tanzil.net. Retrieved 29 December 2017. "Tanzil – Quran Navigator | القرآن الكريم". tanzil.net. Retrieved 29 December 2017. A high rank person...