York Minster astronomical clock

Damage to the clock's mechanism was sustained during a fire, on 9 July 1984; after 10 years' work attempting repair, vergers ceased winding it, owing to its inaccuracies of time-keeping.

[citation needed] The front dial shows the locations of the Sun and certain navigational stars as would be seen by a pilot flying south above York Minster.

For decoration it carries a few basic star patterns (considerably distorted owing to the projection used) and an eccentric zodiac / ecliptic / calendar ring faced with silver, and restricted in width to the distance between the solstitial points.

It is centred on the north celestial pole and, with its encircling silvered ring of 24 hour intervals, rotates once a sidereal day relative to a fixed meridian-index.

For the equation correction, a wheel on a lever associated with the mean solar arm rolls round an annular cam of sheet brass about 61 cm in diameter.