Google Earth Community: Greenwich Longitude off by 106m in Keyhole?

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PriceCollins
Inspector Detector

Reged: 08/10/05
Posts: 1597
Loc: Fairfax, VA, USA

Prime Meridian is misnamed

02/20/06 12:57 AM

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The posting by seer provided an excellent background on the Prime Meridian. There have been several primary meridians. The attached placemark shows where in England they can be seen.

Bradleys' (1824) is still the basis for the Ordnance Survey maps. It can be seen at the Chingford Pillar, also called Bradley's Obelisk.

Airy's (1851) meridian is 19 feet to the east of Bradley's. That is the meridian tourists see at the Royal Observatory's Flamstead House in Greenwich. It is called the Prime Meridian, Airy's Meridian, or the Greenwich Meridian.

Google Earth correctly uses the International Reference Meridian (IRM) based on the WGS84 scheme. It is a further 102.4779 meters eastwards.

However, Google received some unfortunate publicity because they called that meridian the Prime Meridian when Latitude-Longitude is turned on (Control-L). It should be displayed as the International Reference Meridian.

Another good source of information is History of the Prime Meridian

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Entire topic
Subject	Posted by	Posted on
Greenwich Longitude off by 106m in Keyhole?	LionelB	06/06/05 03:40 PM
Re: Greenwich Longitude off by 106m in Keyhole?	unruh	03/26/08 03:01 AM
Re: Greenwich Longitude off by 106m in Keyhole?	Bob_of_Barham	07/17/08 01:58 PM
Re: Greenwich Longitude off by 106m in Keyhole?	Felippo	11/07/07 03:45 AM
Re: bugginess near 0 longitude	ChadNetzer	07/29/05 08:07 PM
Re: bugginess near 0 longitude	fgrose	08/21/05 05:31 PM
World Geodetic System	seer	06/06/05 04:04 PM
Re: World Geodetic System	unruh	03/16/08 11:05 AM
Re: World Geodetic System	simon_a	08/04/07 03:20 PM
We won't give an INCH!	Rambler24	09/17/07 05:08 AM
Prime Meridian is misnamed	PriceCollins	02/20/06 12:57 AM

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