In the third verse (97), it was said: وَهُوَ الَّذِي جَعَلَ لَكُمُ النُّجُومَ لِتَهْتَدُوا بِهَا فِي ظُلُمَاتِ الْبَرِّ وَالْبَحْرِ (And He is the one who made for you the stars, so that you may be guided by them in 'darknesses' of the land and the sea). In other words, it is being said here that there are other stars too, besides the sun and the moon, which are no less unique a manifestation of the perfect power of Almighty Allah. Out of many considerations of Divine wisdom, one immediate benefit they provide for human beings travelling on high seas or open lands is that they can chart their course in the darkness of nights when it is not easy to do so. Experience bears out that even in the days of highly sophisticated guiding systems, there are alternative situations when the guidance from the position of stars cannot be totally ignored.
The point made in this verse is that one should rise above heedlessness and shortsightedness and see that these stars are also there observing the command of their maker and mover. They are there neither by themselves nor to be there nor to keep doing what they do for ever. Those who have pinned their sights on them and have ignored to look at their maker are terribly short-sighted, and ominously deceived indeed.
After that, it was said: قَدْ فَصَّلْنَا الْآيَاتِ لِقَوْمٍ يَعْلَمُونَ (We have elaborated the signs for people who know). The statement clearly indicates that those who do not recognize the presence and power of Allah Ta` ala even from such open signs are unaware and unconscious.