The Islamic Lunar Calendar

http://www.hijricalendar.com/qibla.html

Allah's perfect Creations

Quran Surah 9:36-37

Creation of time (exactness of time)
Solar day (sunset, sunrise)
Lunar months (moonset, moonrise)
Qiblat prayer direction and international dateline (eastward, westward towards Kaabah)
Muslim prayer times (Subuh, Zohor, Asar, Maghrib and Isya)
Ramadan Fasting (determination of start and end)