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The days of the week

أيام الأسبوع

The seven days God made the weekly cycle of time; the best of them is Friday: on it Adam was created, admitted to the Garden and taken out of it, the Hour rises only on a Friday, and in it is an hour of answered prayer 1 2.

Depth

At a glance

Astronomy and timekeeping

Summary

The seven days from Saturday to Friday; the Qur'an names them in the six days of creation and in the appointed Friday.

In the texts

The hadith says the best day the sun rises on is Friday: on it Adam was created, entered the Garden and left it, the Hour rises only on a Friday, and in it is an hour in which no Muslim asks without being given.

People and things also explored

Maragha Observatory· Pari Mahal, Srinagar· Sharaf al-Dawla's observatory at Baghdad· Qibla-finding by stars, winds, mountains and rivers· Sizes of the heavenly bodies· Distances of the heavenly bodies from the Earth· The seven climates· The second motion (the planets' own motion along the zodiac)

Sources

  1. Sahih Muslim
  2. Jami' al-Tirmidhi
Cite this page

islam.museum contributors. “The days of the week”. islam.museum, https://islam.museum/en/concept/ayyam-al-usbu/. CC BY-SA 4.0. Last updated 2026-11-09.

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Wing

Time

Eras, timelines, this day in history, any year in the Islamic world. Related

Maragha Observatory

The observatory Hulagu ordered built on a fortified hill west of the town of Maragha in Azerbaijan after the fall of Baghdad, to the plans of Nasir al-Din al-Tusi, who became its first director. Founded in 657/1259, it is, in the Encyclopaedia of Islam's account, the first large-scale Islamic observatory whose organisation and structure are known in detail: it had a residence for Hulagu, a mosque, a rich library and large instruments, and was paid for by pious endowments. It gave rise to the Zij-i Ilkhani, worked for some 55 or 60 years, and lay in ruins by 740/1339.