"The Celtic Wheel of the Year Calendar ©"

Ancient Sun/Moon Calendars & ones you can buy and use in modern times.

Photo © T. O'Brien


Graphic © J. Rufus

Both the above images were carved upon ancient stone megaliths in Ireland over 5000 years ago, by a people who were expert astronomers and very skilled builders. With none of the technology available to modern mankind, they constructed complex structures in stone which not only endured for five millennia, but were built so accurately that they still perform their astronomical functions today. The image on the left was carved upon the backstone of a passage mound on at Loughcrew. This area is known also as Sleive na Caillighe, meaning The Hill of the Sorceress or Witches' Hill. Words in Irish meaning 'witch' also mean 'female Druid priest' . Those whom history calls "The Druids" did not build the ancient mounds of Ireland, (since they were there long before the Milesian invasion and were built by the pre-Celts), but they understood their astronomical use. These massive stone monuments are extremely accurate 'stone computers' which can be used to predict the dates of the euinoxes and solstices, solar and lunar eclipses, the seasons and the passing of the years.

The eight-rayed sun-symbol shown above on the left only becomes illuminated by a sunbeam passing down the east-facing stone-lined passage of Cairn T on the hill of Carnbane West, Loughcrew, County Meath at the time of the Equinoxes, when the sun rises and sets due East and West. Thus, the structure of the cairn enables these two dates to be accurately fixed in the yearly calendar. They marked the mid-points of Spring and Autumn, and were two of the eight important fire festivals of the Celtic Year. The year was symbolised by the ancients as an eight-rayed sun or an eight-spoked wheel.

As well as using the accurate placing of massive stones within a monument to form a perpetual calendar, the pre-Celts carved symbols deeply into the stones. The symbol on the right above is carved onto Kerbstone K51 at Dowth, County Meath. Archaeologists dubbed it "The Stone of theSeven Suns" However, the images could more accurately be called "planets" since the carvings on this stone appear to depict the planets of our Solar System, and so are an ancient 'astronomy lesson' preserved in stone.

A new look at an ancient concept in calendars.

30 pages, clear covers

Normal "solar" calendar dates

Daily Moon phase image

Sun & Moon Eclipse data

Solstice & Equinox dates

5000 year-old illustrations

Historical information

Plenty of room for daily notes

THIS "THE CELTIC WHEEL OF THE YEAR SUN/MOON CALENDAR ©" IS NOT JUST A CALENDAR, BUT A SMALL BOOK CRAMMED WITH INFORMATION ABOUT THE ANCIENT CARVED STONES OF IRELAND. There are 13 calendar pages. The moon phase is shown for each day, plus information on a different carved Irish stone for each of the 13 "Moonths". The times of eclipses, equinoxes, solar and lunar eclipses are shown for the current year. There is plenty of space for the user to make notes for each day, and an overlap each end with the normal solar year dates. By keeping the old calendars and their notes, it is possible to make a study of the interaction of the Moon's Cycle with all aspects of life on Earth for future reference. Such a "Moon Diary" has already been found by pilots, beekeepers and organic gardeners to give a fascinating insight into the hidden rhythms of animal life, plant growth and the weather; as the current year's notes are compared with those of previous years. The spiral binding of this unique calendar allows it to be hung up to display the calendar page for each month together with its wealth of information on the 'stone of the moonth'.

1994 was the first year of production for "The Celtic Wheel of the Year Sun/Moon Calendar ©" which is based upon the astronomical knowledge of the ancient Druids, and illustrated with designs as carved onto stone megaliths by the New Stone Age inhabitants of the island of Ireland. The Sun, Moon and Earth interact in a cycle which takes about 19 years to complete, so each solar year has a different pattern of moon phases until 19 years have passed, when the cycle returns (almost!) to its beginning pattern and repeats again. In ancient times huge megalithic monuments were erected which functioned as 'stone computers' to calculate this complicated cycle. These incredible constructions, which have lasted 5000 years, enabled the pre-Celts, the Celts and their Druid priest/astronomers to calculate the passage of time and to predict the occurrence of seasons and eclipses. "The Celtic Wheel of the Year Sun/Moon Calendar ©" has extensive notes on the ancient Celtic Druids and their astronomy. It is illustrated with the exact designs which still exist as carved onto ancient Irish stones 5000 years ago. Some of these cannot be directly viewed by visitors at present due to ongoing archaeological work. Thus, this unique calendar, printed on special textured paper to simulate ancient stone, will be of immense iinterest to tourists and anyone interested in the history of ancient Ireland.

"The Celtic Wheel of the Year Sun/Moon Calendar ©"


"Celtic Sun/Moon Calendars ©" from The Plug-inOffice contain a wealth of carefully researched information, as well as showing moon phases. Each one is produced in Ireland's Southern Province of Munster. Support rural industry!

There are two versions :-

"The Celtic Wheel of the Year Sun/Moon Calendar ©" (as detailed above), and -

"The Celtic Tree Alphabet Sun/Moon Calendar ©" based upon the ancient Celtic Tree Alphabet, as used by the Druids, and featured in Robert Grave's famous book "The White Goddess"

"Celtic Sun/Moon Calendars ©"

NOTE: both "The Celtic Tree Alphabet Sun/Moon Calendar ©" and "The Celtic Wheel of the Year Sun/Moon Calendar ©" will not be available in the 2002 version due to the personal circumstances of the researcher/designer, but the version for 2003 should be available by October 2002. Check this webpage for details.


When in print, both these calendars are available to order FROM:-

The Plug-in Office, Cloonmanagh, CULLEN, County Tipperary, Republic of Ireland. e-mail plugin@iol.ie

(NOTE: There are no Zip Codes or Post Codes used in The Republic of Ireland).


UK Sterling£ plus postage & packing

IRELAND Irish PUNTS £ plus postage & packing

NORTH AMERICA PRICE US$, plus packing, handling & shipping


Pay by British or Irish Postal Order or by Sterling Draft (for fastest delivery).

Orders paid by cheque are acceptable, but be aware that bank clearance in Ireland can cause delays averaging 3 weeks in despatch.


then press ctrl+P to print the Form out from your P.C onto a sheet of paper.

Please post (MAIL) the signed form with your payment to the given address.

Please note, The Plug-in Office does not yet have any facility to accept credit card orders . You may reserve calendars by e-mail if you then confirm the order and send payment by post/mail. Sorry for any inconvenience!

To see an animation of the sun's rays passing across this 5000-year-old Year-wheel symbol carved in an Irish passage mound, press on the button to go to Tim O'Brien's website "Light Years Ago", which gives details of his excellent book of the same name (from Black Cat Press).
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