Muslim Presence in Karaj: Karaj, a major city in Alborz Province, has a significant Muslim population that has grown over decades as the city expanded. The community is well-established, with Islamic practices woven into daily life. While specific historical records are limited, the presence of mosques and prayer places across the city reflects a long-standing and active Muslim community.

Community Implantation: The Muslim community in Karaj is served by numerous prayer places, including Sahebalzaman Mosque located within the city. Nearby areas such as Malard, Shahriar, and Garmdareh also host mosques like Malard Jame Mosque and Kereshteh's Vali Asr Mosque, indicating a widespread network of Islamic centers. In the broader region, prominent mosques like Imam Khomeini Mosque in Tehran provide additional facilities for worshippers.

Prayer-Time Orientation: Muslims in Karaj follow the five daily prayers—Fajr, Dhuhr, Asr, Maghrib, and Isha—timed according to the sun's position. These times vary throughout the year due to seasonal changes in sunrise and sunset, influenced by the city's latitude. Karaj operates on Asia/Tehran timezone, and prayer calculations follow a standard method. The Qibla direction is oriented towards Mecca, which lies at a specific bearing and distance from the city.