The invention of the astrolabe made it possible to calculate latitude by measuring the angle between the horizon and a celestial body. Columbus couldn't calculate longitude because there was no accurate method at the time to measure the time difference between his location and the prime meridian.
The invention that made it possible to calculate latitude was the astrolabe, which measured the angle between the horizon and a celestial body. Columbus couldn't calculate longitude because there were no accurate methods or instruments available at that time to measure it.
The invention of the astrolabe made it possible to calculate latitude by measuring the angle between the sun and the horizon. However, Columbus couldn't calculate longitude because there was no accurate method for determining it at that time.
