In the 15th century, the western and eastern sail technology was comparable. The mariner's compass, so crucial to navigation out of sight of land, was developed from the Chinese magnetized needle of the 8th century, and it traveled via land route to the Mediterranean where about the 12th century the Europeans or the Arabs developed the true mariner's compass (floating), but China soon received the improved model.27 So both East and West had the mariner's compass in the 15th century. Stern post rudders, which are a significant advantage over steering oars in steering larger ships in tumultuous seas, were utilized in China as early as the 1st century A. D. These were not developed until about the 14th century in Europe, but stern post rudders were available to both East and West in the 15th century. Knowledge of wind and sea currents was considerably more advanced in the West by the Portuguese and Dutch than by the Chinese in the 15th century.28 The West also had superior knowledge of celestial navigation, that advantage being shared by the Arabs; the Chinese were reduced to utilizing Islamic astronomers and mathematicians at the Imperial Observatory, but had not extended celestial work to the practical work of navigating as of yet. The Arab and the Portuguese cross-staff or balestilha developed in the 14th century, and the astrolabe for even better measurement of the angle of celestial objects in the early 15th century. 29 In military technology, both East and West had cannon, armor and horses.
In summary, before the 15th century, the Chinese were ahead in oceangoing ship technology, with larger compartmented ships and efficient fore-and-aft lugsails on multiple masts. In the 15th century, the Chinese and the Europeans were in rough overall parity. The Chinese were ahead in ship size and hull construction, and the Portuguese were ahead in the arts of navigation, and there was parity in sail technology (the Chinese with battened lugsails, the Portuguese...
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