Five Pillars of IslamThe Five Pillars of Islam ( أركان الإسلام; also أركان الدين "pillars of the religion") are fundamental practices in Islam, considered to be obligatory acts of worship for all Muslims. They are summarized in the hadith of Gabriel. The Sunni and Shia agree on the basic details of the performance and practice of these acts, but the Shia do not refer to them by the same name (see Ancillaries of the Faith, for the Twelvers, and Seven pillars of Ismailism).
TwilightTwilight is light produced by sunlight scattering in the upper atmosphere, when the Sun is below the horizon, which illuminates the lower atmosphere and the Earth's surface. The word twilight can also refer to the periods of time when this illumination occurs. The lower the Sun is beneath the horizon, the dimmer the twilight (other factors such as atmospheric conditions being equal). When the Sun reaches 18° below the horizon, the twilight's brightness is nearly zero, and evening twilight becomes nighttime.
Salah timesSalat times are prayer times when Muslims perform salat. The term is primarily used for the five daily prayers including the Friday prayer, which takes the place of the Dhuhr prayer and must be performed in a group of worshippers. Muslims believe the salah times were taught by Allah to Muhammad. Prayer times are standard for Muslims in the world, especially the fard prayer times. They depend on the condition of the Sun and geography. There are varying opinions regarding the exact salah times, the schools of Islamic thought differing in minor details.
MosqueA mosque (mɒsk ) or masjid (ˈmæsdʒɪd,_ˈmʌs- ; both from masjid, ˈmasdʒid; place of ritual prostration) is a place of prayer for Muslims. Mosques are usually covered buildings, but can be any place where prayers (salah) are performed, including outdoor courtyards. The first mosques were simple places of prayer for Muslims, and may have been open spaces rather than buildings. In the first stage of Islamic architecture, 650-750 CE, early mosques comprised open and closed covered spaces enclosed by walls, often with minarets from which calls to prayer were issued.