Both the Celts and Vikings had similar views on the Tree of Life. The only difference was the symbols each tribe chose for it. Most of the legends say that the creators or a descendant, sang it into being so he could practice his craft. This would be the invention of the magic of music. The music made the tree (Ash tree for some, and another Viking legend says a Spruce tree topped with flowers leaved in gold.). The top of the tree is in the heavens, scattered everywhere its branches. In the branches, we have the moon gleaming, and a Great Bear protector. The shining stars are the Fruit. And the groupings of stars on each branch are the major constellations and the ones surrounding its trunk(if one were to looking from above and down on the tree like a round slice), are the zodiacal constellations.
All around the world, different cultures had their Tree of Life own explanations for the Moon. Some myths say that beneath the great tree was a well called the Well of Fate, and within a pair of swans were feeding, from whom all swans on earth were descended. The water from this well is so holy, it made all things put into it go pure white. If we look at the surviving story of Yggdrasill, we see a high tree, that is soaked with shining loam and from that comes dew which falls in the valley that is ever green. This Tree stands over a Well of Fate. Now if we find the other myths as symbols of Sky stories then this well would be the Moon. The light of the sun casts into the well makes phases of the moon. The swans as well as a hare with a basket is clearly visible on the moon, if you know how to see it.
The god Odin is but one God in the many myths of Northern Europe where a God has sacrificed or lost one of his eyes at a well of knowledge or wisdom. Also seen as a cauldron. The ‘Man in the Moon’ with his drinking horn, tipped up so he can imbibe the waters of the well is Mimir and he can also be seen on the face of the moon. Or you can look it instead as Odin receiving the a skull of Heiddraupnir and Hoddrofnir’s horn. Again, the stories of the moon depend on the tribe and they all vary. There is no one Norse religion, nor is there no one Celtic religion, nor is there no one 1st Nations religion. And they would roll in their graves at the nonsense that goes on today with new-agers trying to fit all under an umbrella of “Celtic spirituality”. Just as a Tribal Cree Chief would be insulted if you thought his bell dance, or ceremony, or God was the same as the Pawnee tribe. You’d be laughed right off the reserve.