Quran Tells A Heliocentric Cosmos With Sun In Motion
Geocentric Vs Heliocentric

In past scientists believed that the Earth stood still in the center of the universe and Sun, stars and everything else revolved around it. Then Copernicus told the Heliocentric Theory which says that the Sun is motionless at the center of the solar system with the planets revolving around it. Then we came to know that planets not only revolve around the Sun but also rotate around their own axis. Now we know that our Earth rotates around its axis at 1600km/hr, which causes day and night on Earth. Then it revolves around the Sun at 107,000km/hr which is responsible for our 12 months year and different seasons on Earth.
Rotation Of Sun & Galactic Year

Quran Miracle As It Says Sun Is Not Stationary
But Quran almost around 1400 years ago told us that the Sun is also not stationary and also tells about the movement of planets, Earth and all celestial bodies in space and also around their own axis.
وَهُوَ الَّذِي خَلَقَ اللَّيْلَ وَالنَّهَارَ وَالشَّمْسَ وَالْقَمَرَ ۖ كُلٌّ فِي فَلَكٍ يَسْبَحُونَ
And it is He who created the night and the day and the Sun and the moon; all in an orbit are swimming. Surah Anbiya 21:33
٣٨ وَالشَّمْسُ تَجْرِي لِمُسْتَقَرٍّ لَهَا ۚ ذَٰلِكَ تَقْدِيرُ الْعَزِيزِ الْعَلِيمِ
And the sun runs its course for a term and place appointed for it. That is the decree of the All-Mighty, the All-Knowing. Surah Yasin 36:38

Meaning Of Word “فَلَكٍ” And “يَسْبَحُونَ”
The Arabic words used in these verses are فَلَكٍ and يَسْبَحُونَ which means the “Sky / Orbits” and “Swim without sinking” respectively. The Arabic word يَس