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* https://metode.es/revistas-metode/article-revistes/relojes-de-sol-sombras-del-pasado.html
* https://www.sciencefriday.com/educational-resources/a-human-sundial/
* https://books.google.es/books?id=D8j6Jq1SwM8C&pg=PT56&lpg=PT56&dq=shadows+human+body+clock+time&source=bl&ots=Jz9yrxvnaq&sig=ACfU3U2JvhYLh3vZ5aanj2txm_U8bcTyFA&hl=ca&sa=X&ved=2ahUKEwjUkuai4_TnAhWuzoUKHZ6DAy8Q6AEwE3oECAcQAQ#v=onepage&q=shadows%20human%20body%20clock%20time&f=false
* https://www.readersdigest.ca/home-garden/tips/how-to-tell-the-time-without-clock/
* https://books.google.es/books?id=P0RoAgAAQBAJ&pg=PA207&lpg=PA207&dq=shadows+human+body+clock+time&source=bl&ots=AjSZTj16BN&sig=ACfU3U02oXJAtZyypiYRdF7yChfSqomg6Q&hl=ca&sa=X&ved=2ahUKEwjUkuai4_TnAhWuzoUKHZ6DAy8Q6AEwFXoECAkQAQ#v=onepage&q=shadows%20human%20body%20clock%20time&f=false
 
[[Categoria:Gnomònica| Peu]]