Geographic extremes and human adaptation

حَتَّىٰٓ إِذَا بَلَغَ مَطْلِعَ ٱلشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍ لَّمْ نَجْعَل لَّهُم مِّن دُونِهَا سِتْرًا

Until, when he came to the rising of the sun [i.e., the east], he found it rising on a people for whom We had not made against it any shield.