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Z is for Zero - AlphaPet Traditional Geocache

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thisisace: To be checked

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Hidden : 10/01/2015
Difficulty:
2 out of 5
Terrain:
2 out of 5

Size: Size:   small (small)

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Geocache Description:

A prime meridian, based at the Royal Observatory, Greenwich, in London, was established by Sir George Airy in 1851. It was long marked by a brass strip in the courtyard, now replaced by stainless steel, and, since 16 December 1999, has been marked by a powerful green laser shining north across the London night sky.

Global Positioning System (GPS) receivers show that the marked prime meridian at Greenwich is not exactly at zero degrees, zero minutes and zero seconds but at approximately 5.3 seconds of arc to the west of the meridian (meaning that the meridian appears to be 102 metres east of this line). In the past this offset has been attributed to the establishment of reference meridians for space-based location systems such as WGS 84 (which GPS relies on) or that errors gradually crept into the International Time Bureau timekeeping process.

The meridian line passes through the area to the east of Peterborough and is marked by a variety of permanent markers. The Z cache is close to one of these, at the co-ordinates above.

Additional Hints (Decrypt)

Vafvqr

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)