The ancient Celtic people used a lunar calendar, closely tied with nature - in which each month was represented by a moon. Each month started when the moon was full and it was further divided into fortnights, or two-week periods. A dark fortnight followed a bright fortnight.

To align with the Gregorian year, contemporary Pagans use fixed dates for each month rather than following the waxing and waning lunar cycle, otherwise the Celtic Lunar calendar would fall out of sync, because some calendar years have 12 full moons and others have 13. The modern Celtic tree calendar is based on a concept of letters in the ancient Celtic Ogham alphabet, and trees in season at that particular time of year.

The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.

Greenwich Mean Time was adopted across the islands of Great Britain by the Railway Clearing House in 1847 - so that trains ran on time.  

The Celtic Lunar Moon Chart / calendar is for the Northern Hemisphere. Being in New Zealand and Southern Hemisphere we reverse the chart & seasons. 

Ties in beautifully with Matariki - which marks the beginning of the new year in the Māori lunar calendar.  Matariki is the Pleiades star cluster and celebration of its first rising in late June or early July. 

We love to celebrate Matariki - a very special time of the year.