BBC NEWS

BBC programme explores precision timekeeping and rotation challenges

A BBC science programme examines how time is measured with precision and explains why Earth's rotation presents timing challenges.

BBC News

Photo: Chatham House / CC BY 2.0, via Wikimedia Commons

Continue reading at BBC News Publisher? Request removal

World News Pro

The World is always free. Pro makes it yours.

Read with no ads, hear The World News podcast twice a day, save stories, protect your reading streak and play twelve Pro games every morning, for $4 a month.

World News Pro: $4 a month or $36 a year. You are charged today, then again every month or year. It renews automatically until you cancel. Cancel any time online from the Pro page (Manage billing); you keep Pro until the end of the period you paid for. Payment is handled by Stripe.

Pro renews automatically at the price you choose until you cancel. You can cancel online at any time from the Pro page, and you keep Pro until the end of the period you paid for. Payment is handled by Stripe.

Everything in Pro ›