The twelve signs of the zodiac each have an element associated with them. The four elements are Earth, Air, Fire and Water.
Fire signs are Aries, Leo and Sagittarius. The co-ordinates for Sagittarius will be found in the Aries and Leo caches.
Water signs are Scorpio, Cancer and Pisces. The co-ordinates for Pisces will be found in the Scorpio and Cancer caches.
Air Signs are Gemini, Libra and Aquarius. The co-ordinates for Gemini will be found in the Aquarius and Libra caches.
Earth signs are Taurus, Virgo and Capricorn. The co-ordinates for Virgo will be found in the Taurus and Capricorn caches.
Co-ordinates for the bonus "ZODIAC CACHE" will be found in the Sagittarius, Pisces, Gemini, and Virgo caches. A diagram illustrating the series can be found here.
Recommended parking is at N52° 55.619 W003° 03 298. The easiest approach to this cache is from the Aquarius cache. A short walk across the Aquaduct. At a height of 70 feet, the Chirk Aquaduct has 10 spans of 40 feet each. The walk across the Aquaduct is paved /well travelled gravel making it both buggy and wheelchair friendly. However, please take care with young children as the canal is on your left and although it is fenced in on your right you are still quite high in the air. Thomas Telford designed and constructed this aquaduct and it was opened in 1801. Parking near to this cache is all but impossible, and if you find one then you should also buy a lottery ticket as it is your lucky day.
The cache container is a tupperware-like container having the log book, pencil and sharpener (please do not remove), a 2005 date book, a National Trust stick pin, a pair of brass candlesticks and some collectibles. But most importantly you will find the Western co-ordinates for Gemini on the inside cover of the log book as well as on the back of the information card. To balance things out, once you have found this cache you should bring a torch with you as the fastest way to Gemini is through the tunnel.