The meter is the base SI unit of length. It was first defined in 1793 as one ten-millionth of the distance from the equator to the North Pole through Paris. Today it is defined as the distance light travels in vacuum in 1/299,792,458 of a second โ a definition tied directly to the universal speed of light. The meter is the foundation of the metric system used by 95% of the world.
Real-world: A standard door is about 2 metres tall. An Olympic swimming pool is exactly 50 metres long. The Eiffel Tower is 330 metres tall.
Read full meter reference โThe furlong equals 201.168 meters or 1/8 of a statute mile. It originated as the length of a medieval English plough furrow โ "furrow long". Today it survives mainly in horse racing in the UK, Ireland and North America, where race distances are typically 5 to 12 furlongs.
Real-world: The Epsom Derby is run over 1 mile and 4 furlongs (about 2.4 km). The Kentucky Derby is 10 furlongs.
Read full furlong reference โ