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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)
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 ...
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
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 ...
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 ]
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]
Two distinct definitions came into use. Chemists choose to define the AMU as 1 / 16 of the average mass of an oxygen atom as found in nature; that is, the average of the masses of the known isotopes, weighted by their natural abundance. Physicists, on the other hand, defined it as 1 / 16 of the mass of an atom of the isotope ...
The meaning of the preceding definition is as follows. The caesium atom has a ground state electron state with configuration [Xe] 6s 1 and, consequently, atomic term symbol 2 S 1/2. This means that there is one unpaired electron and the total electron spin of the atom is 1/2. Moreover, the nucleus of caesium-133 has a nuclear spin equal to 7/2.