Halley's Meridian Line -- Royal Observatory, Greenwich, London, UK
Posted by: Groundspeak Premium Member Benchmark Blasterz
N 51° 28.673 W 000° 00.089
30U E 708214 N 5707233
Quick Description: The Meridian Line determined by Astronomer Royal Edmond Halley in 1725
Location: London, United Kingdom
Date Posted: 9/21/2016 12:47:31 PM
Waymark Code: WMT416
Published By: Groundspeak Premium Member Waywizard
Views: 6

Long Description:
One of several historical meridian lines surveyed by Astronomers Royal before 1884 (when the Prime Meridian was determined), Halley's Meridian line is marked on the inside and outside of the Royal Observatory at Greenwich.

A nearby historical plaque reads as follows:

"HALLEY'S MERIDIAN LINE

Edmund Halley, the second Astronomer Royal, measured the height of stars above the horizon in time to their passage (or ‘transit’) over the meridian marked by the crosshairs in his telescope with an accurate pendulum clock. Astronomers opened hatches and the roof to observe the stars, with one of the most important observations being the Sun at solar noon.

Edmund Halley's meridian line of 1725 is shown on the wall to your right.

[drawing]

Halley use a large-scale mural quadrant like this (inside the building ahead of you) to provide accurate transit measurements."
Line type: Historical meridian

Tolerance: 103 yds from E-W meridian

If other type, please explain.: Not listed

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Recent Visits/Logs:
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seal13 visited Halley's Meridian Line -- Royal Observatory, Greenwich, London, UK 7/5/2020 seal13 visited it
greysman visited Halley's Meridian Line -- Royal Observatory, Greenwich, London, UK 11/4/2016 greysman visited it
Master Mariner visited Halley's Meridian Line -- Royal Observatory, Greenwich, London, UK 10/10/2016 Master Mariner visited it
Benchmark Blasterz visited Halley's Meridian Line -- Royal Observatory, Greenwich, London, UK 7/20/2016 Benchmark Blasterz visited it

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