It  is important to understand that people in the ancient world adhered  primarily to a Lunar calendar. Important dates were noted  by the lunar cycle, which is why dates tracked by the lunar calendar may vary several days  from year to year.
According to the Irish text "The Book of the Dunn Cow", Brighid's sacred number, representing the nineteen stages of the Celtic Great Year, the time it takes from one new moon to the next to coincide wth the Winter Solstice. It is on the twentieth day that the Goddess tends the flame herself.
The Lunar image at the top of the page is a live Lunar image and reflects the current Moon  phase.
Live Moon Phase Display
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I take Bride as my advocate,
Dear to me is Erin,
Dear to me each land,
Praise be to it!

O white flame of Leinster,
Enlighten the whole land,
Chief of Erin's maidens
Chief of finest women.

Dark the bitter winter,
Cutting its sharpness'
But Bride's mantle
Brings spring to Ireland.
A Triple Moon Production
Links for Moon Rituals
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Triple Moon Productions
Triple Moon Productions
Where to find books on Moon Rituals and Celtic Lore