diamond geezer

 Saturday, July 25, 2020

The earth is divided into two hemispheres - Western and Eastern.
Most things are in one hemisphere, but a few things are in both.

Western Hemisphereboth hemispheresEastern Hemisphere
approx 40 countriesUK, France, Spain, Algeria, Mali, Burkina Faso, Togo, Ghana; Russia, Kiribati, USA, Fijiapprox 105 countries
São Paulo, Mexico City, New York, Buenos Aires, Rio de Janeiro, Los Angeles, Bogotá, Lima, ChicagoLondonthe world's other 50 largest cities
 Arctic, Atlantic, Pacific, SouthernIndian
no mountain over 7000m in heightno mountain over 7000m in heightevery mountain over 7000m in height
(approx 180 of them)

The Prime Meridian runs through the UK.
Most of the UK is in the Western Hemisphere, but approximately 10% is in the Eastern Hemisphere.

Western Hemisphereboth hemispheresEastern Hemisphere
Northern Ireland, Wales, ScotlandEngland 
all the other regionsEast Anglia, London, South East, Yorks & Humber
all the other countiesE Yorks, Lincs, Cambs, Herts, Essex, Greater London, Surrey, W Sussex, E SussexKent, Suffolk, Norfolk
all the other cities Cambridge, Canterbury, Chelmsford, Ely, Norwich
all the other hills over 250mBotley Hill (267m)Betsom's Hill (251m)
all the other 30 longest riversThames, Trent/Humber, Great Ouse, Nene, Witham, Medway 
all the other motorwaysM25M2, M11, M20, M26
all the other 1- & 2-digit A roadsA2, A10, A11, A12, A13, A14, A16, A17, A20, A21, A22, A25, A27, A46, A47, A52A26, A28
all the other airports Norwich, Stansted, City, Southend

The Prime Meridian runs through Greenwich.
This is why London gets to straddle both hemispheres.
About 70% of London is in the Western Hemisphere and 30% in the Eastern Hemisphere.

Western Hemisphereboth hemispheresEastern Hemisphere
all the other boroughsWaltham Forest, Newham, Tower Hamlets, Greenwich, Lewisham, Bromley, CroydonRedbridge, Barking & Dagenham, Havering, Bexley
all the other 'Major Town Centres'StratfordBromley, Ilford, Romford
all the other river crossingsBlackwall TunnelWoolwich Foot Tunnel, Woolwich Ferry
all the other Royal ParksGreenwich 
all the other League clubs Charlton Athletic
all the other buildings over 100m in heightLegacy Tower (Stratford)Manhattan Loft Gardens (Stratford), Stratosphere Tower (Stratford), Pioneer Point (Ilford)

London's transport network also straddles the two hemispheres.

Western Hemisphereboth hemispheresEastern Hemisphere
tramtube, DLR, Overground, rail, busDangleway
Bakerloo, Circle, Metropolitan, Northern, Piccadilly, Victoria, W&CCentral, District, H&C, Jubilee 
235 tube stationsStratford*34 tube stations
25 DLR stationsEast India*, Stratford*, Stratford High Street†17 DLR stations
101 Overground stationsStratford*, Wood Street*, Highams Park†8 Overground stations
25 Crossrail stationsStratford*15 Crossrail stations
all the other rail stationsStratford*, Hither Green43 rail stations
approx 400 bus routesapprox 70 bus routesapprox 90 bus routes
all the other river piers North Greenwich, Royal Wharf, North Woolwich, Woolwich, Woolwich Arsenal

Pedantry note: The precise dividing line between the Western and Eastern Hemispheres depends on which Greenwich Meridian you choose.

The original 1884 meridian passes through the Airy Transit Circle at the Royal Greenwich Observatory.
The current IERS Reference Meridian, as used by astronomers and GPS, runs slightly further east.
Across the London area this creates a strip 102m wide which is in the Eastern Hemisphere according to the first meridian but in the Western Hemisphere according to the current meridian.
Locations in this ambiguous zone include the Blackheath tea hut, the Cutty Sark pub and the Sainsbury's inside the Stratford Centre.

* Stratford, East India and Wood Street stations lie on the original meridian, so would be in the Western Hemisphere if you choose the current meridian.
† Stratford High Street and Highams Park stations lie on the current meridian, so would be in the Eastern Hemisphere if you choose the original meridian.
Hither Green is the only London station to straddle both hemispheres no matter which meridian you choose.

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