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In page Treaty of Tordesillas:
"The Treaty of Zaragoza did not modify or clarify the line of demarcation provided by the Treaty of Tordesillas, nor did it validate Spain's claim to equal hemispheres (180° each), so the two lines divided the earth into unequal hemispheres. Portugal's portion was roughly 191° whereas Spain's portion was roughly 169°. Both portions have a large uncertainty of ±4° because of the wide variation in the opinions regarding the location of the Tordesillas line.[citation needed]
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