PM stands for various terms. Discover the full forms, meanings, and possible interpretations of PM across different fields and industries.
That meridian from which longitude is reckoned By common consent this is now the meridian of Greenwich Originally, was that meridian on which the magnetic variation of compass was zero in a certain latitude Has varied in longitude between Jerusalem and Brazil, but most frequently through Azores and Canary Islands First passed through London (St Paul's Cathedral) in 17th century First drawn through Greenwich, 1794.
GeographicGeographyLocationSystemLast updated: