During this scene in 'Interstellar', you can hear a ticking noise on the soundtrack every 1.25 seconds. Each tick represents a day passing on Earth. 
Discussion
Amazing film.
The original script was so much better.
I've never been aware of this till now, is there a place we can read up on that?
nostr:npub1h8nk2346qezka5cpm8jjh3yl5j88pf4ly2ptu7s6uu55wcfqy0wq36rpev might still have a copy somewhere
I forget the numbers, but does the math in their exposition check out?