Please read the story of Zul-Qarnain for yourself from the Quran. If you read it from Translated sources, question any bits that appear in brackets for these are added by the translators.
Zul-Qarnain (man with two horns) is the majority of Arabs call Alexander the Great. Only in recent times Islamic theologians shifted away from this after discovering Alexander the Great is pagan and most likely bisexual. Muhammad was Arab, so we know who he meant. Now they suggest it is Cyrus of Persia. Regardless who he is, the verse has a clear scientific errors claim.
Quran Chapter [18:83-86]
83. They ask you concerning Zul-qarnain. Say, “I will rehearse to you something of his story.”
84. Verily We established his power on earth, and We gave him the ways and the means to all ends.
85. One way he followed,
86. Until, when he reached the setting of the sun, he found it set in a spring of murky water: Near it he found a People: We said: “O Zul-qarnain! either to punish them, or to treat them with kindness.”
This is consistent with the Hadith that says the Sun goes to rest under Allah’s throne.
Argue as some will blindly insist, my grandmother died insisting the landing on the moon was a lie. And that the earth is flat. Before she passed away she insisted everyone in her generation believed the earth is flat until the 1960’s when the first man landed on the moon. The Quran through this verse and some 8 verses (see our earlier posts) that describes the earth as flat like a rug, carpet, bed, and spread. For nearly 1400 years, the Quran convinced many that the earth is flat and the sun goes to sleep under Allah’s throne.
Zakri Naik had tried to twist the meaning of this verse when questioned and suggested the word used in the verse وجدها (Wajadha) which every Arab knows means “and he found it” as meaning “appear to him”. The word for appear to is ضهر له (Dhar lah). VERY Different!!
How did Zakri get away with it? All the Arabic speaking people in the audience are NOT going to dare to stand up and dispute him. And here is more explanation for those who dare to open their eyes.
https://wikiislam.net/wiki/Dhul-Qarnayn_and_the_Sun_Setting_in_a_Muddy_Spring_-_Part_Two