TV Horizon - Season 45 Episode 15 : Do You Know What Time It Is? Horizon - Season 45 Episode 15 : Do You Know What Time It Is? 7.516/10 by 32 users Particle physicist Professor Brian Cox asks, 'What time is it?' It's a simple question and it sounds like it has a simple answer. But do we really know what it is that we're asking? Brian visits the ancient Mayan pyramids in Mexico where the Maya built temples to time. He finds out that a day is never 24 hours and meets Earth's very own Director of Time. He journeys to the beginning of time, and goes beyond within the realms of string theory, and explores the very limit of time. He discovers that we not only travel through time at the speed of light, but the experience we feel as the passing of time could be an illusion. Details Casts Posters Images Title Horizon - Season 45 Episode 15 : Do You Know What Time It Is? Alternative Titles BBC Horizon First Air Date 1964-02-04 Last Air Date 2024-07-22 Number of Episodes 1169 Number of Seasons 60 Genres Documentary, Networks BBC Two, Casts Plot Keywords , Episodes List Horizon Season 45 :Episode 1 How to Kill a Human Being How to Kill a Human Being 2008-01-15 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 2 Total Isolation Total Isolation 2008-01-22 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 3 What on Earth is Wrong With Gravity? What on Earth is Wrong With Gravity? 2008-01-29 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 4 Is Alcohol Worse than Ecstasy? Is Alcohol Worse than Ecstasy? 2008-02-05 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 5 How to Make Better Decisions How to Make Better Decisions 2008-02-12 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 6 How to Live to be 101 How to Live to be 101 2008-02-19 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 7 Prof. Regan's Supermarket Secrets Prof. Regan's Supermarket Secrets 2008-02-26 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 8 Are we Alone in the Universe? Are we Alone in the Universe? 2008-03-04 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 9 How Much is Your Dead Body Worth? How Much is Your Dead Body Worth? 2008-03-18 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 10 How Does Your Memory Work? How Does Your Memory Work? 2008-03-25 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 11 The President's Guide to Science The President's Guide to Science 2008-09-16 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 12 How Mad Are You? (1 of 2) How Mad Are You? (1 of 2) 2008-11-11 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 13 How Mad Are You? (2 of 2) How Mad Are You? (2 of 2) 2008-11-18 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 14 Jimmy's GM Food Fight Jimmy's GM Food Fight 2008-11-25 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 15 Do You Know What Time It Is? Do You Know What Time It Is? 2008-12-02 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 16 Allergy Planet Allergy Planet 2008-12-09 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 45 :Episode 17 Where's My Robot? Where's My Robot? 2008-12-16 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.