Caliph Hazrat Umar (RA) established the Hijri calendar in 17 AH, designating the year of the Prophet's migration as the first year.

A lunar year is approximately 354 days, while a solar year is about 365 days, making the lunar year 11 days shorter.

The Treaty of Najran was an agreement between the Prophet (PBUH) and the Christian delegation from Najran, establishing peace and Jizya status.

9 AH is known as the Year of Delegations because many tribes from across the Arabian Peninsula came to Medina to accept Islam.

Muharram is the first month of the Islamic Hijri calendar.

The Constitution of Medina (Mithaq-e-Madina) was established in 622 CE, which corresponds to 1 AH, shortly after the Hijra.

Rajab is one of the four sacred months (Al-Ashhur al-Hurum) in Islam, during which fighting was traditionally prohibited.

The Farewell Pilgrimage (Hajjat-ul-Wada) was performed by Prophet Muhammad (PBUH) in the year 10 AH.

The Pledges of Al-Aqaba (First and Second) occurred in the final years of the Meccan period before the migration to Medina.

The Battle of Mu'tah took place in the year 8 AH between the Rashidun army and the Byzantine Empire.

Aam-ul-Huzn occurred in the 10th year of Prophethood, marked by the death of the Prophet's closest supporters.

The Hijri calendar begins with the migration (Hijra) of the Prophet Muhammad (PBUH) from Makkah to Medina.

The Treaty of Hudaybiyah was a peace agreement signed for a period of ten years.

Shawwal is the tenth month of the Islamic calendar and immediately follows the month of fasting, Ramadan.

There are four sacred months in the Islamic calendar: Muharram, Rajab, Dhu al-Qa'dah, and Dhu al-Hijjah.

The Prophet Muhammad (PBUH) performed his final Hajj, known as the Farewell Pilgrimage, in the year 10 AH.

Caliph Umar ibn al-Khattab (RA) institutionalized the Hijri calendar during his caliphate.

After the siege of Taif, the people of the city eventually sent a delegation to enter into a peace agreement with the Prophet (PBUH).

A lunar year consists of approximately 354 days, while the solar year has 365 days, resulting in a difference of about 11 days.