Islamic Calendar Guides, Articles & Observances
Explore authoritative educational guides, astronomical calculation criteria, lunar month histories, and complete Islamic holiday schedules verified by modern lunar calculations and official Umm al-Qura standards.
Islamic Holidays 2026: Complete Hijri Calendar Dates & Observances (1447–1448 AH)
A comprehensive calendar reference detailing precise Gregorian and Hijri dates for Ramadan 1447, Eid al-Fitr, Day of Arafah, Eid al-Adha, and the 1448 AH Islamic New Year. Includes astronomical conjunction tables, fasting virtues, and public holiday planning timelines across major Muslim-majority nations.
Authoritative Islamic Calendar Articles
12 Islamic Months in Order with Meanings & Spiritual Significance
An exhaustive guide to all twelve lunar months from Muharram to Dhu al-Hijjah. Explains linguistic origins in classical Arabic, the four sacred months (Al-Ashhur Al-Hurum), and prophetic sunnah fasts.
The History and Astronomy of the Islamic Calendar
Discover how the Islamic calendar was established by Caliph Umar ibn al-Khattab, the celestial mechanics of lunar crescent observation, and why lunar years cycle through all solar seasons every 33 years.
How Does the Hijri Calendar Work? A Complete Guide
Understand the mathematics of lunar synodic cycles (29.53 days), why Islamic months alternate between 29 and 30 days, the rules of intercalation, and how crescent visibility determines the start of each month.
Why Do Islamic Dates Change Every Year?
Learn the mathematical foundation behind the 10 to 12 day annual difference between the Hijri lunar year (354 days) and the Gregorian solar year (365 days), and why holidays move backward through the seasons.
How Many Days Are in a Hijri Year & Month?
A quick reference detailing regular (354 days) and leap (355 days) lunar years, the 30-year tabular cycle, and how physical moonsighting accounts for real-world religious month declarations.
Umm al-Qura Calculation Methodology & Editorial Standards
Transparent breakdown of our astronomical calculation algorithms, Makkah lunar conjunction criteria, Julian Day Number formulas, and our dedicated editorial research desk.
Essential Islamic Timekeeping Tools
Complement your reading with our fast, mobile-friendly Islamic date calculators and converters: