The moon
The moon a light set in stations so you may know the count of years and reckoning; it was split in the Prophet ﷺ's day as a sign for the people; and it wanes through phases until it returns like an old palm-stalk.
In the Qur'an · 8
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فَلَمَّا رَءَا ٱلْقَمَرَ بَازِغًا قَالَ هَـٰذَا رَبِّى ۖ فَلَمَّآ أَفَلَ قَالَ لَئِن لَّمْ يَهْدِنِى رَبِّى لَأَكُونَنَّ مِنَ ٱلْقَوْمِ ٱلضَّآلِّينَ
And when he saw the moon uprising, he exclaimed: This is my Lord. But when it set, he said: Unless my Lord guide me, I surely shall become one of the folk who are astray.
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هُوَ ٱلَّذِى جَعَلَ ٱلشَّمْسَ ضِيَآءً وَٱلْقَمَرَ نُورًا وَقَدَّرَهُۥ مَنَازِلَ لِتَعْلَمُوا۟ عَدَدَ ٱلسِّنِينَ وَٱلْحِسَابَ ۚ مَا خَلَقَ ٱللَّهُ ذَٰلِكَ إِلَّا بِٱلْحَقِّ ۚ يُفَصِّلُ ٱلْـَٔايَـٰتِ لِقَوْمٍ يَعْلَمُونَ
He it is Who appointed the sun a splendour and the moon a light, and measured for her stages, that ye might know the number of the years, and the reckoning. Allah created not (all) that save in truth. He detaileth the revelations for people who have knowledge.
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وَٱلْقَمَرَ قَدَّرْنَـٰهُ مَنَازِلَ حَتَّىٰ عَادَ كَٱلْعُرْجُونِ ٱلْقَدِيمِ
And for the moon We have appointed mansions till she return like an old shrivelled palm-leaf.
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لَا ٱلشَّمْسُ يَنۢبَغِى لَهَآ أَن تُدْرِكَ ٱلْقَمَرَ وَلَا ٱلَّيْلُ سَابِقُ ٱلنَّهَارِ ۚ وَكُلٌّ فِى فَلَكٍ يَسْبَحُونَ
It is not for the sun to overtake the moon, nor doth the night outstrip the day. They float each in an orbit.
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بِسْمِ ٱللَّهِ ٱلرَّحْمَـٰنِ ٱلرَّحِيمِ ٱقْتَرَبَتِ ٱلسَّاعَةُ وَٱنشَقَّ ٱلْقَمَرُ
The hour drew nigh and the moon was rent in twain.
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وَإِن يَرَوْا۟ ءَايَةً يُعْرِضُوا۟ وَيَقُولُوا۟ سِحْرٌ مُّسْتَمِرٌّ
And if they behold a portent they turn away and say: Prolonged illusion.
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وَجَعَلَ ٱلْقَمَرَ فِيهِنَّ نُورًا وَجَعَلَ ٱلشَّمْسَ سِرَاجًا
And hath made the moon a light therein, and made the sun a lamp?
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كَلَّا وَٱلْقَمَرِ
Nay, by the Moon