On the equator, the sun rises and sets at almost exactly 6 in the morning and 6 in the evening, every single day of the year. There is no 'long summer day' and no 'short winter day' - it is always about 12 hours of light and 12 hours of dark. People who live close to the poles find this very strange to imagine.
Uganda has two big yellow circles painted on the road just south of Kampala, on either side of the equator line. Children love taking photos with one foot in each hemisphere. There is also a sign saying you are at 'altitude 1,233 metres' and 'latitude 0 degrees, 0 minutes, 0 seconds' - the only place that line is true on the whole planet.
People sometimes do a famous experiment at the equator. They fill a bowl with water, pull out the plug, and watch which way the water spirals as it goes down. Just north of the line, it spirals one way. Just south of the line, the other way. Right on the line, it goes straight down. Scientists argue about whether this is fully true or partly a trick - but it makes children laugh every time.
The equator runs through 13 countries on its way around the Earth - including Brazil, Colombia, Kenya, Indonesia and Uganda. Most of the world's rainforests grow near the equator, where it is warm and wet all year. So do many of the world's coffee plants, including a lot of Uganda's coffee.