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Sun and moon letters in Arabic

In Arabic, “the” is written ال (al-). Sometimes you hear the l, and sometimes it disappears. Which one depends on the first letter of the word. These two groups are called the sun letters and the moon letters.

الشَّمْس وَالْقَمَر
Ash-shams wal-qamar
The sun and the moon

The word for “the”

Arabic does not have a separate word for “the”. Instead, ال (alif and lām) is joined to the front of the noun: كِتَاب (kitāb) is “a book” and الْكِتَاب (al-kitāb) is “the book”.

The alif at the start is not pronounced when the word follows another word in a sentence; you hear the lām join onto the previous word. This article focuses on what happens to the lām itself.

Moon letters: the l is pronounced

With moon letters (al-ḥurūf al-qamariyyah), the lām is pronounced clearly. It is named after الْقَمَر (al-qamar, the moon), where you hear al-qamar.

ء ب ج ح خ ع غ ف ق ك م ه و ي
  • الْحَمْدُ (al-ḥamdu): the praise
  • الْكِتَابُ (al-kitābu): the book
  • الْيَوْم (al-yawm): the day

In a vowelled text, the lām before a moon letter carries a sukūn (ـْ).

Sun letters: the l disappears

With sun letters (al-ḥurūf ash-shamsiyyah), the lām is silent and the first letter of the word is doubled instead. It is named after الشَّمْس (ash-shams, the sun), which is pronounced ash-shams, not al-shams.

ت ث د ذ ر ز س ش ص ض ط ظ ل ن
  • الرَّحْمَٰن (ar-Raḥmān): the Most Merciful
  • النَّاس (an-nās): mankind
  • الصِّرَاط (aṣ-ṣirāṭ): the path

In a vowelled text, the lām has no mark and the sun letter after it carries a shaddah (ـّ), showing that it is doubled.

Spotting them in Surah Al-Fatihah

Al-Fatihah contains both kinds. Try reading these and listen for the lām:

  • الْحَمْدُ لِلَّهِ (al-ḥamdu lillāh): moon letter ح
  • الرَّحْمَٰنِ الرَّحِيمِ (ar-Raḥmāni r-Raḥīm): sun letter ر
  • الْمُسْتَقِيمَ (al-mustaqīm): moon letter م
  • الضَّالِّينَ (aḍ-ḍāllīn): sun letter ض

An easy way to remember

Sun letters are mostly made with the tip of the tongue near the teeth, the same place the l sound is made. That is why the l blends into them. Moon letters are made further back in the mouth or with the lips, so the l stays separate. Say a few aloud and you will feel the difference.

There are exactly 14 of each, which makes them easy to check.

FAQ

Frequently asked questions

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How many sun letters are there?

There are 14 sun letters: ت ث د ذ ر ز س ش ص ض ط ظ ل ن.

How many moon letters are there?

There are 14 moon letters: ء ب ج ح خ ع غ ف ق ك م ه و ي.

Why is it ar-Rahman and not al-Rahman?

Rā (ر) is a sun letter, so the lām of al- is silent and the rā is doubled.

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