What is the International Date Line? Neil deGrasse Tyson and comedian Chuck Nice break down the history and purpose of the IDL. How do we know we needed a date line? Find out how the need for an international date line was discovered and why it was an accident. Where did we decide to put the date line? Plus, Chuck questions the existence of Mountain Time.

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Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic cohosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!

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00:00 The international date line is weird
02:00 Circumnavigation & Time
08:07 Observer Bias
11:40 IDL Placement