Parallels & Meridians of London

Key latitude/longitude references for London:

Parallels (Latitude)

• 51°30' N — Central London (Charing Cross / Trafalgar Square).
• 51°28' N — Heathrow Airport.
• 51°25' N — Richmond Park.

Meridians (Longitude)

• 0°00' W (Prime Meridian) — Royal Observatory, Greenwich (defines GMT/UTC).
• 0°07' W — St Paul's Cathedral.
• 0°12' W — Buckingham Palace.

Greater London spans roughly 51°28'–51°42' N and 0°05' E–0°35' W. The Prime Meridian line is marked in the Observatory courtyard and on the pavement in Greenwich Park.