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- Sundial (16148 bytes)
85: ...sted of two small flat faces, joined by a hinge. Diptychs usually folded into little flat boxes suitable fo...
89: ...gles to geographic features. Large (meter-sized) diptychs may have been used for [[navigation]] in ancient ... - Pope Gelasius I (4083 bytes)
- Navigation (15650 bytes)
77: When combined with a plumb bob, some diptychs could also determine latitude. Basically, when t...
93: ...d the wooden latitude instruments for night use. Diptychs remained in use during the day, until shadowing a... - History of science in early cultures (11033 bytes)
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