Sunrise and sunset in Tabora, Tanzania

Each twilight begins at the morning time and ends at the evening one.

• Longest day: December 21, 12 h 25 min, from sunrise at 06:34 to sunset at 18:59.
• Shortest day: June 21, 11 h 50 min, from sunrise at 06:55 to sunset at 18:45.

• Sunrise and sunset are when the top of the Sun meets a level horizon, allowing for the usual bending of light by the air. Hills, buildings and height shift what you see by a few minutes.
• Civil, nautical and astronomical twilight end when the Sun is 6°, 12° and 18° below the horizon. Golden hour here is the photographers’ usual definition: the Sun less than 6° above it.
• Worked out when the page loads from NOAA’s solar equations, for 5° S, 32.8° E, and accurate to about a minute.

How the layers work, where their data comes from and what they can’t tell you: Day and night, live, The Sun, Moon and planets