Portable and foldable 19th century necklace sundial - GIF
Portable and foldable 19th century necklace sundial.
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Previously:
1570 Sundial ring - photo
1790 portable compass sundial - photo
17th century portable sundial and compass - photo
3D-printed "digital" sundial - video
Multi-paneled sundial for time in different countries - photo
Oblique transparent sundial - GIF
