The Royal Greenwich Observatory, founded in 1675, is an iconic institution known for its contributions to the study of astronomy and the measurement of time. Over the years, it has undergone several name changes and rebranding efforts. Today, some synonymous terms for the Royal Greenwich Observatory include the Royal Observatory, Greenwich; the Greenwich Observatory; and the Royal Greenwich Museum. Though the institution no longer conducts astronomical research, it has maintained its status as a museum and educational center, attracting thousands of visitors each year. Its most famous attraction is the Prime Meridian, the line that marks 0° longitude and divides the eastern and western hemispheres of the earth.