Why did Ulugbek need a navigation tool of such a large size?

Ulugbek needed a navigation tool of this size, as it determined not only the height of the sun, but also described the starry sky. Larger tool sizes gave more accurate values.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.