Gregory's Meridian Line in Saint Andrews, Scotland

A meridian is a scientific term denoting an imaginary demarcation line that runs north to south and is drawn for astronomical purposes. The line can be used to mark zero degrees longitude and is used to divide the Earth into the Western and Eastern hemispheres, as well as to set time zones. In 1637 the Scottish astronomer and mathematician James Gregory laid down such a line in his St. Andrews laboratory. What makes this so outstanding is that this was nearly 200 years before a similar configuration was instituted in Greenwich, England. In 1884, representatives from 22 countries gathered in...