If you have ever waited for a train at a railway station in India, you may have noticed a small but curious detail on the station name board. Along with the station’s name, there is often a number ...

Height above sea level: If you have ever stood on a railway platform and looked closely at the station name board, you may have noticed something interesting. Along with the station’s name, many ...

Height above mean sea level is only one of at least three measures of height. Two others are the height above a perfect ellipsoid that approximates the shape of Earth, and the height above an ...