Why does the International Date Line look like it was drawn by a toddler? On a globe, drawing a line that separates one day from the next sounds simple enough. So why does it zigzag across the Pacific Ocean in a way that looks like a mistake?

Mathematician Vanessa Madu is here to explain. Join her as she investigates the surprisingly mathematical problem of keeping track of time on a spinning sphere. Along the way, you'll discover why the Date Line exists in the first place, how centuries of history and geopolitics have bent it wildly out of shape, and the surprising mathematical consequences that mean now, for two hours a day, there are three calendar days happening all at once.

Blending mathematics, geography, history and a good amount of curiosity, this talk explores how what should be a simple straight line on a map tells a remarkable story of the unexpected things that can happen when maths meets human decision making.

How To Get Your Tickets

1. Book your desired number of tickets and await an email from us confirming your order. This is NOT a ticket.

2. Present your confirmation on arrival at the venue. Ensure that you take personal ID with you or you may be turned away

Pricing Information

• For this event, there are two ticket types: Free Tickets, and Free Tickets with £5 Donation + TFG booking fee

• For Free Tickets, no further payment applies beyond the TFG booking fee

• For Free Tickets with £5 Donation + TFG booking fee, the total payable per ticket is £7.95. The full £5 donation goes straight to the Royal Institution to continue their excellent scientific education work

• Please note: Tickets for RI Members and RI Patrons retail at £7.90 on the third-party site

Additional Information

• This is a theatre event for children and adults to enjoy together. We recommend our family talks for children aged 7–13, though they can be enjoyed by audiences of all ages.

• Doors open 2:15pm. Show starts 2:30pm

• For further event information, please visit here

Accessibility Information

• Please note: We recommend, where you have specific access requirements, bookings are made directly through the event organiser, however, we are here to assist where possible. Please get in touch with us prior to booking if you have access requirements. For accessibility information, please visit here

Key Terms of Sale

• Tickets are non-refundable / non-exchangeable
• Tickets cannot be resold or transferred
• The account holder must be in attendance at the event
These are the key terms. Full terms apply and are available here