Commemoration of Omar Khayyam
National occasion Strength of evidence: Strong
Honouring Omar Khayyam, mathematician, astronomer and poet of the Rubaiyat.
Sunday May 18, 2025
Gregorian
May 18, 2025
Lunar Hijri
Dhuʻl-Qiʻdah 20, 1446
Solar Hijri
Ordibehesht 28, 1404