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The torquetum had a very important improvement: it wasn't so friggin' confusing.
Guo Shoujing managed to create a new form of equatorial armillary sphere, a sort of disassembled one, the equatorial torquetum.
This is why in Chinese the equatorial sphere is typically referred to as the 浑仪 (literally "muddy apparatus", and the torquetum is referred to as the 简仪 ("simple apparatus".
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