The Yirritja clan’s ancient knowledge of the phases of ngalindi (the moon)and changing tides extends long beyond modern science’s understanding of links between the two. This is one example of First Nations peoples’ unique relationship with the world around them. In Arnhem Land, there are two main clans or moieties; the Yirritja moiety and the Dhuwa moiety. People, animals, plants and even the different winds are either Yirritja or Dhuwa. The Yirritja, Yolngu people, have an incredibly special relationship with the ngalindi (the moon) and the tides. Over many thousands of years, the Yirritja clan have developed an intricate understanding of the relationship between the two As the tides rise, water fills the moon. _ _ As the tide falls, the water runs out of the moon and it is empty for three days. _ _ _The moon begins to fill again as the tide rises. _ The Manydjikay, a group of Yolngu people, from the Yirritja clan nation have a song about the ngalindi (moon) and the changing tides.