Geography & Earth
Basic

Time Zone Difference

Each 15 degrees of longitude equals one hour.

Formula

Δt=Δlongitude15∘\Delta t = \frac{\Delta \text{longitude}}{15^\circ}

Variables

\Delta longitudeLongitude difference

Example

45° of longitude corresponds to 45/15 = 3 hours of time difference.

Did You Know?

Each 15° of longitude equals one hour — the reason the globe is divided into 24 time zones.

timelongitudebasic