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Video & Multimedia

BootinUp

(47,094 posts) Fri Aug 25, 2017, 09:24 PM Aug 2017

6

Carl Sagan explains how Eratosthenes

Calculated the earths circumference over 2000 years ago.

3 replies

= new reply since forum marked as read

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Carl Sagan explains how Eratosthenes (Original Post) BootinUp Aug 2017 OP

I loves me some Cosmos! Gore1FL Aug 2017 #1

We did! Thank you for saying so. Nt BootinUp Aug 2017 #2

Cool. I knew that Eratosthenes figured that out but... hvn_nbr_2 Aug 2017 #3

Gore1FL

(21,104 posts)

1. I loves me some Cosmos!

Reply to BootinUp (Original post)

Fri Aug 25, 2017, 09:37 PM

Aug 2017

We lost a treasure when we lost Sagan.

BootinUp

(47,094 posts)

2. We did! Thank you for saying so. Nt

Reply to Gore1FL (Reply #1)

Fri Aug 25, 2017, 09:39 PM

Aug 2017

hvn_nbr_2

(6,486 posts)

3. Cool. I knew that Eratosthenes figured that out but...

Reply to BootinUp (Original post)

Sat Aug 26, 2017, 12:32 PM

Aug 2017

I never heard how he did it. Pretty cool reasoning.

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