How far is The Stoop from London Heathrow in kilometer?

How far is The Stoop in the western suburbs of London, England, officially the Twickenham Stoop Stadium, the home stadium of both Harlequins rugby union team and Harlequins Rugby League who play in the Guinness Premiership and Super League respectively from London Heathrow Airport or Heathrow, located in the London Borough of Hillingdon, the world's busiest airport in terms of international passenger traffic measured in The kilometre (American spelling: kilometer), symbol km, the unit of length in the metric system, equal to one thousand metres and is therefore exactly equal to the distance travelled by light in free space in of a seconds?

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Show reasoning Reasoning

I followed this chain of reasoning:

I know from locally stored knowledge that:
51°27'01"N is the latitude of The Stoop ([fact: ["151775273@trueknowledge.com"]])

51°28'39"N is the latitude of London Heathrow ([fact: ["642364848@trueknowledge.com"]])

0°20'39"W is the longitude of The Stoop ([fact: ["638523632@trueknowledge.com"]])

0°27'41.04"W is the longitude of London Heathrow ([fact: ["642364852@trueknowledge.com"]])

By calculation (generator: ["distance_between3@trueknowledge.com"]) I know that:
8.66229767203 kilometres is the distance between The Stoop and London Heathrow

By calculation (generator: ["second_parameter@trueknowledge.com"]) I know that:
kilometre is the second parameter of 8.66229767203 kilometres

I know from locally stored knowledge that:
Fact 1: 1 is the multiplier that converts kilometre and kilometre ([fact: ["684486512@trueknowledge.com"]])

Fact 1 is true for all time ([fact: ["689997328@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 1 is true at June 18th 2013, 22:17:23

By calculation (generator: ["now@trueknowledge.com"]) I know that:
The current time is June 18th 2013, 22:17:23

By calculation (generator: ["first_parameter@trueknowledge.com"]) I know that:
8.66229767203 is the first parameter of 8.66229767203 kilometres

By calculation (generator: ["product@trueknowledge.com"]) I know that:
8.66229767203 is the product of 1 and 8.66229767203

By calculation (generator: ["class_parametered_object@trueknowledge.com"]) I know that:
length is the class of the parametered object 8.66229767203 kilometres

By calculation (generator: ["parametered_object_corresponding_to@trueknowledge.com"]) I know that:
8.66229767203 kilometres is the parametered object corresponding to length and 8.66229767203 and kilometre

By calculation (generator: ["equivalent_to6@trueknowledge.com"]) I know that:
Fact 2: 8.66229767203 kilometres is equivalent to 8.66229767203 kilometres

Fact 2 is true at June 18th 2013, 22:17:23

Fact 2: kilometre is the unit used in 8.66229767203 kilometres

I used the following facts to provide this answer:

51°27'01"N is the latitude of The Stoop

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51°28'39"N is the latitude of London Heathrow

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0°20'39"W is the longitude of The Stoop

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0°27'41.04"W is the longitude of London Heathrow

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1 has always been the multiplier that converts kilometre and kilometre and will be forever

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