The Saracens had no use for these measurements, no reason to sail around the earth to India. They were in India. Cathay and the Spice Islands were on their doorstep. But Europeans needed a route to India, and the Crusades taught them that they did. The riches of the world were in the East, and the Saracens had them. Europeans were the Have Not nations, and they knew it.
The Saracens were already situated in prosperous regions like India and had direct access to valuable trade resources, such as those from Cathay and the Spice Islands. Unlike the Europeans, who sought to explore and navigate routes to India, the Saracens had no need for extensive measurements or long voyages, as their wealth was readily available where they lived. This contrast highlights the geographical and economic advantages held by the Saracens compared to the ambitions of the Europeans.
Additively, the Crusades awakened European awareness of the East's riches, fueling their desire to establish trade routes. The disparity in wealth between the Saracens and Europeans underscored Europe's status as a “Have Not” region, driving their quest for access to these incredibly valuable resources. Thus, the Europeans' exploration was motivated by a need to reclaim their place in a world dominated by the riches of the East, which they sought but did not possess.
