Sun and moon letters

In Arabic and Maltese, the consonants are divided into two groups, called the sun letters or solar letters (Arabic: حروف شمسية ḥurūf shamsiyyah, Maltese: konsonanti xemxin) and moon letters or lunar letters (Arabic: حروف قمرية ḥurūf qamariyyah, Maltese: konsonanti qamrin), based on whether they assimilate the letter lām (ﻝ l)[1] of a preceding Arabic definite article al- (الـ), which is an important general rule used in Arabic grammar. Phonetically, sun letters are ones pronounced as coronal consonants, and moon letters are ones pronounced as other consonants.

Sun letters (red) and moon letters (black)

These names come from the fact that the word for 'the Sun', al-shams, pronounced ash-shams, assimilates the lām, while the word for 'the Moon', al-qamar, doesn't. This also applies to the Maltese language where they are written as ix-xemx and il-qamar. And these are the sun and moon letters.

Rule

When followed by a sun letter, the /l/ of the Arabic definite article al- assimilates to the initial consonant of the following noun, resulting in a doubled consonant. For example, "the Nile" is pronounced an-Nīl, not al-Nīl.

When the Arabic definite article (الْـ) is followed by a moon letter, no assimilation takes place.

The sun letters represent the coronal consonants according to the phonology of Classical Arabic, and the moon letters represent all others. The sun and moon letters are as follows:

Sun letters	ت	ث	د	ذ	ر	ز	س	ش	ص	ض	ط	ظ	ل	ن
	t	th	d	dh	r	z	s	sh	ṣ	ḍ	ṭ	ẓ	l	n
	/t/	/θ/	/d/	/ð/	/r/	/z/	/s/	/ʃ/	/sˤ/	/dˤ/	/tˤ/	/ðˤ/	/l/	/n/

Moon letters	ء	ب	ج	ح	خ	ع	غ	ف	ق	ك	م	ه	و	ي
	ʼ	b	j	ḥ	kh	ʻ	gh	f	q	k	m	h	w	y
	/ʔ/	/b/	/d͡ʒ/*	/ħ/	/x/	/ʕ/	/ɣ/	/f/	/q/	/k/	/m/	/h/	/w/	/j/

Hamza is not considered a letter.

Jīm

The letter ج jīm is pronounced differently depending on the region of the speaker. In many regions it represents a coronal consonant such as [d͡ʒ] or [ʒ]. However, in Classical Arabic, it represented a palatalized voiced velar plosive /ɡʲ/ or a voiced palatal plosive /ɟ/ (and a contemporary pronunciation as [ɡ] or [ɟ] is retained in Egypt, Sudan and southern Yemen / Oman). As a result, it was classified as a moon letter, and it does not assimilates the article in Classical Arabic. Maltese ġ /d͡ʒ/ is also considered a moon consonant, whereas its voiceless counterpart ċ /t͡ʃ/ is a sun consonant.

However, in some dialects of Moroccan Arabic and Palestinian Arabic, jīm (often /ʒ/) assimilates, like a sun letter, e.g., ij-jamal ('camel').[2][3]

Emphatic consonants

In some Palestinian Arabic dialects, al before an emphatic consonant only assimilates in place of articulation but not in pharyngealization, hence it-ṭāwla instead of aṭ-ṭāwla (‏طاولة‎ 'table').[3]

Maltese

The sun (konsonanti xemxin) and moon (konsonanti qamrin) letters are as follows:

Sun letters	ċ	d	n	r	s	t	x	ż	z
Sun letters	/t͡ʃ/	/d/	/n/	/r/	/s/	/t/	/ʃ/, /ʒ/	/z/	/t͡s/, /d͡z/

Moon letters	b	f	ġ	g	għ	h	ħ	j	k	l	m	p	q	v	w
Moon letters	/b/	/f/	/d͡ʒ/	/g/	/ˤː/	silent	/h/,/ħ/	/j/	/k/	/l/	/m/	/p/	/ʔ/	/v/	/w/

If a word starts with any of the moon letters, the definite article il- stays the same and does not assimilate, while with the sun letters it assimilates accordingly to: iċ-, id-, in-, ir-, is-, it-, ix-, iż-, iz-. It is also worth mentioning that words starting with vowels, and the letters għ, and h get the definite article l- (minus the initial i). When the definite article comes exactly after a word ending in a vowel, the initial <i> of the article always drops, as in "dak ir-raġel ra r-raġel" (that man saw the man). When a word starts with two consonants, the definite article used is l-, but an i is attached at the beginning of the word: skola > l-iskola and Żvezja > l-Iżvezja.[4]

Orthography

In the written language, the ⟨ال‎⟩ al is retained regardless of how it is pronounced.[1] When full diacritics are used, assimilation may be expressed by putting a shaddah ⟨ ّ⟩ on the consonant after the lām ⟨ل‎⟩. Non-assimilation may be expressed by placing a sukūn over the lām ⟨لْ‎⟩.

Most modern-written Arabic names (including personal names and geographical Arabic names) do not follow the consonant assimilation rule or the shaddah when Latinized in Latin-spelled languages. Sometimes the sun and moon rules are not followed in casual speech. They are also mostly spaced rather than hyphenated.

E.g. personal name:

الرَّحْمَن‎ - Al Rahman or El Rahman instead of Ar-Raḥmān
geographical name: الْجُمْهُورِيَّةُ التُّونِسِيَّة‎ - al-Jumhuriyah al-Tunisiyah instead of al-Jumhūrīyatu t-Tūnisīyah

Examples
Sun letters			Moon letters
الشَّمْس‎	ash-shams	'the sun'	الْقَمَر‎	al-qamar	'the moon'
الثِّقَة‎	ath-thiqah	'the confidence'	الْمُرْجَان‎	al-murjān	'the coral'

Moon/Lunar Letters حروف قمرية ḥurūf qamarīyah
Letter	IPA	/l/ in the definite article "al" remains	Examples
ء‎ ʼ	/ʔ/	الْإ, الْأ‎ al-’a.../ al-’u...; al-’i...	الْأَخُ‎ al-ʼakh(u) = the brother الْأُذُنُ‎ al-’udhun(u) = the ear الْإِبْرِيقُ‎ al-’ibrīq(u) = the jug
ب‎ b	/b/	الْبـ‎ al-b...	الْبَيتُ‎ al-bayt(u) = the house
ج‎ j	/d͡ʒ/, /ʒ/, /ɟ/, /ɡ/	الْجـ‎ al-j...	الْجَوزُ‎ al-jawz(u) = the walnut
ح‎ ḥ	/ħ/	الْحـ‎ al-ḥ...	الْحَجُّ‎ al-Ḥajj(u) /alˈħad.d͡ʒu, alˈħaʒ.ʒu, alˈħaɟ.ɟu, alˈħaɡ.ɡu/ = the pilgrimage
خ‎ kh	/x/	الْخـ‎ al-kh...	الْخَوْخُ‎ al-khawkh(u) = the peach
ع‎ ʻ	/ʕ/	الْعـ‎ al-ʻ...	الْعَقْلُ‎ al-‘aql(u) = the mind الْعُشْبُ‎ al-‘ush·b(u) = the grass الْعِيدُ‎ al-‘id(u) = the holiday, festival
غ‎ gh	/ɣ/	الْغـ‎ al-gh...	الْغَرَامُ‎ al-gharām(u) = the love, romance, passion
ف‎ f	/f/	الْفـ‎ al-f...	الْفِكْرُ‎ al-fik·r(u) = the thought
ق‎ q	/q/	الْقـ‎ al-q...	الْقِرْدُ‎ al-qird(u) = the monkey
ك‎ k	/k/	الْكـ‎ al-k...	الْكَوْكَبُ‎ al-kawkab(u) = the planet
م‎ m	/m/	الْمـ‎ al-m...	الْمَتْحَفُ‎ al-mat·ḥaf(u) = the museum
و‎ w	/w/	الْو‎ al-w...	الْوَفِيَُ‎ al-wafiy(u) = the faithful = the color
ي‎ y	/j/	الْيـ‎ al-y...	الْيَانْسُونُ‎ al-yānsūn(u) = the anise
ه‎ h	/h/	الْهـ‎ al-h...	الْهَوَاءُ‎ al-hawāʼ(u) = the air

Sun/Solar Letters حروف شمسية ḥurūf shamsīyah
Letter	IPA	/l/ in the definite article "al" assimilates, the following consonant geminates (الْـّ‎)	Examples
ت‎ t	/t/	التّـ‎ at-t...	التِّينُ‎ at-tīn(u) = the fig
ث‎ th	/θ/	الثّـ‎ ath-th...	الثَّعْلَبُ‎ ath-tha‘lab(u) = the fox
د‎ d	/d/	الدّ‎ ad-d...	الدُّبُّ‎ ad-dubb(u) = the bear
ذ‎ dh	/ð/	الذّ‎ adh-dh...	الذَّكَرُ‎ adh-dhakar(u) = the male
ر‎ r	/r/	−الرّ‎ ar-r...	الرَّبُّ‎ ar-Rabb(u) = the Lord
ز‎ z	/z/	الزّ‎ az-z...	الزَّنْبَقُ‎ az-zanbaq(u) = the lily
س‎ s	/s/	السّـ‎ as-s...	السَّمَاوَاتُ‎ as-samāwāt(u) = the Heavens, firmament, skies
ش‎ sh	/ʃ/	الشّـ‎ ash-sh...	الشَّرْقُ‎ ash-shar·q(u) = the east
ص‎ ṣ	/sˤ/	الصّـ‎ aṣ-ṣ...	الصَّحْرَاءُ‎ aṣ-ṣaḥ·rāʼ(u) = the desert
ض‎ ḍ	/dˤ/	الضّـ‎ aḍ-ḍ...	الضَّبَابُ‎ aḍ-ḍabāb(u) = the fog
ط‎ ṭ	/tˤ/	الطّـ‎ aṭ-ṭ...	الطَّاهِرُ‎ aṭ-ṭāhir(u) = the pure
ظ‎ ẓ	/ðˤ/	الظّـ‎ aẓ-ẓ...	الظُّهْرُ‎ aẓ-ẓuh·r(u) = the noon
ن‎ n	/n/	النّـ‎ an-n...	النِّسَاءُ‎ an-nisā(u) = the women
ل‎ l	/l/	الْلـ‎ al-l...	الْلَوْنُ‎ al-lawn(u) = the color

References

Abboud, Peter F.; et al. (1983). Elementary Modern Standard Arabic 1. Cambridge UP. pp. 123–124. ISBN 0-521-27295-5.
Heath, Jeffrey (2013). Jewish and Muslim Dialects of Moroccan Arabic. Routledge. p. 169. ISBN 978-1-136-12642-0. Although CA j […] was not a "sun" letter, its MA reflex 'ʾ normally is, hence ž-žbəl 'the mountain' (CA al-jabal). There are some exceptions in Jebli dialects. […] borrowings from e.g. French normally assimilates, as in ž-žuṛnal 'the newspaper'.
Sirhan, N. (2014). Folk Stories and Personal Narratives in Palestinian Spoken Arabic. Springer. p. 91. ISBN 978-1-137-32576-1. Although /j/ is not a sun letter, in PA it assimilates as though it were: il-jamal – ij-jamal (camel). […] when an emphatic sun letter has a less emphatic counterpart (i.e. non-pharyngealised) […] the definite article assimilates in place of articulation but not in pharyngealisation. [..] it-ṭāwla […] is-ṣalātu
Aidan. "The Definite Article in Maltese".

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[emsa-1] Abboud, Peter F.; et al. (1983). Elementary Modern Standard Arabic 1. Cambridge UP. pp. 123–124. ISBN 0-521-27295-5.

[2] Heath, Jeffrey (2013). Jewish and Muslim Dialects of Moroccan Arabic. Routledge. p. 169. ISBN 978-1-136-12642-0. Although CA j […] was not a "sun" letter, its MA reflex 'ʾ normally is, hence ž-žbəl 'the mountain' (CA al-jabal). There are some exceptions in Jebli dialects. […] borrowings from e.g. French normally assimilates, as in ž-žuṛnal 'the newspaper'.

[PA-3] Sirhan, N. (2014). Folk Stories and Personal Narratives in Palestinian Spoken Arabic. Springer. p. 91. ISBN 978-1-137-32576-1. Although /j/ is not a sun letter, in PA it assimilates as though it were: il-jamal – ij-jamal (camel). […] when an emphatic sun letter has a less emphatic counterpart (i.e. non-pharyngealised) […] the definite article assimilates in place of articulation but not in pharyngealisation. [..] it-ṭāwla […] is-ṣalātu

[4] Aidan. "The Definite Article in Maltese".