He is the author of the best-selling book Matariki: The Star of the Year, written in both English and te reo Māori, and has a large following on social media where he shares podcasts and videos about Māori astronomy in both English and te reo.
He says that over the years, Matariki has become a country-wide phenomenon.
"Matariki has become a beacon. It's a traditional, astronomically-based celebration that has now become part of the wider New Zealand identity.
So, to be able to be part of that movement really drives me to continue to work in this space."
Professor Matamua's journey through the discipline of astronomy has not been a traditional one, but the knowledge base he has developed from a Māori perspective has led to him becoming an expert in the field.
"I am not a scientist from a Western perspective of what science is. But I am a scientific practitioner from a Māori point of view. I believe I practise that every day, and every evening when I am out looking at the night sky.
"I am looking for certain scientific elements, but I'm also looking at deity, genealogy, and traditional cultural narratives that are woven into the tapestry that is the night sky."
He hopes that one day Matariki, given it is unique to New Zealand, will become the most significant event in Aotearoa above other celebrated holidays.
"I'd like to see it [Matariki] become Aotearoa's main celebration year after year. I would like to see actioned those principles of reflecting on those that we have lost in the year that's gone, celebrating who we are, and then planning for the next season and the next year."