The Qatari Almanac (Arabic: التقويم القطري, romanized: al-Taqwīm al-Qaṭari) was an annual almanac authored by religious scholar Sheikh Abdullah Ibrahim Al-Ansari that integrated traditional and astronomical knowledge, offering invaluable insights into prayer timings, seasonal weather patterns, and local celestial navigation across the Persian Gulf region.

It also offered insights into the distances between Doha and other Qatari towns in kilometers and included poetry and sayings reflecting traditional knowledge of environmental shifts with each season.

[4] Al-Ansari's work not only aligned the Hijri calendar with the zodiac but also preserved a treasure trove of star lore dating back to the pre-Islamic period in the Arabian Peninsula, encapsulated in a genre known as anwa.

[1] Most importantly, the almanac chronicled the practical use of shadow lengths to determine prayer times before the advent of modern clocks, a method still observable in many older mosques.

Containing many religious and literary works, the complex hosts the Qatari Calendar House, the Center for Islamic Studies, and the Sheikh Al-Ansari Library.