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  2. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    Whereas a hydrogen atom moves at 1,600 m/s at room temperature and a nitrogen atom moves at 510 m/s, a caesium atom moves at a much slower speed of 130 m/s due to its greater mass. [ 65 ] [ 10 ] The hyperfine frequency of caesium (~9.19 GHz) is also higher than other elements such as rubidium (~6.8 GHz) and hydrogen (~1.4 GHz). [ 10 ]

  3. Ramadan - Wikipedia

    en.wikipedia.org/wiki/Ramadan

    Observed by: Muslims: Type: Islamic: Celebrations: Community iftars and prayers: Observances: Fasting ()Almsgiving (zakat, specifically zakat ul-Fitr, and sadaqah)Commemorating the Night of Power (Lailat ul-Qadr)

  4. International Atomic Time - Wikipedia

    en.wikipedia.org/wiki/International_Atomic_Time

    International Atomic Time (abbreviated TAI, from its French name temps atomique international [1]) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid. [2]

  5. Abraham ibn Daud - Wikipedia

    en.wikipedia.org/wiki/Abraham_ibn_Daud

    Abraham ibn Daud (Hebrew: אַבְרָהָם בֶּן־דָּוִד הַלֵּוִי אִבְּן דָּאוּד, romanized: ʾAvrāhām ben-Dāvīd halLēvī ʾībən Dāʾūd; Arabic: ابراهيم بن داود, romanized: ʾIbrāhīm ibn Daʾūd) was a Spanish-Jewish astronomer, historian and philosopher; born in Córdoba, Spain about 1110; who was said to have been killed for his ...

  6. Muhammad al-Bukhari - Wikipedia

    en.wikipedia.org/wiki/Muhammad_al-Bukhari

    Resting place: Imam Bukhari Mosque near Samarkand, Uzbekistan: Era: Islamic Golden Age (Abbasid era)Region: Abbasid Caliphate: Main interest(s) Hadith, Aqidah: Notable work(s) Sahih al-Bukhari

  7. David's Tomb - Wikipedia

    en.wikipedia.org/wiki/David's_Tomb

    David's Tomb (Hebrew: קבר דוד המלך Kever David Ha-Melekh; Arabic: مقام النبي داود Maqam Al-Nabi Daoud) is a site that, according to a Medieval (9th century) tradition, is associated with the burial of the biblical King David.

  8. Sunan Abi Dawud - Wikipedia

    en.wikipedia.org/wiki/Sunan_Abi_Dawud

    Abu Dawood compiled twenty-one books related to Hadith and preferred those Ahadith (plural of "Hadith") which were supported by the example of the companions of Muhammad. As for the contradictory Ahadith, he states under the heading of 'Meat acquired by hunting for a pilgrim': "if there are two contradictory reports from the Prophet (SAW), an investigation should be made to establish what his ...

  9. Dawud al-Ta'i - Wikipedia

    en.wikipedia.org/wiki/Dawud_al-Ta'i

    Abu Sulaiman Dawud ibn Nusair al-Tā'ī, (Arabic: ابو سلیمان داؤد بن نصیر الطائي) usually referred to as Dawud Tā'ī, (died between 776 and 783 CE) was an Islamic scholar and Sufi mystic.