The new moon coincides with the rising of the cluster of stars also known as the Pleiades that herald the start of the return to warmer times following Sunday's solstice.
Mr Thatcher said there were lots of messages associated with Matariki, including to celebrate new beginnings, learn from the past year's mistakes and to carry on with the good things of life.
He said not much happened in winter so Matariki brought more joy into that time of the year.
Major events celebrating Matariki will include a fashion show of contemporary Maori art and performances in the Tauranga Art Gallery on Thursday, Matariki and the Night Sky presentation at the Fergusson Park observatory on June 26, a kids' art studio at the gallery on June 27 and kids' art clay studios from July 6 to July 10, Te Reo language and storytelling sessions on June 29 and July 1, an evening of stories at Papamoa Library on July 16, and kite day at Fergusson Park on July 11.
MasterChef NZ winners Kasey and Karena Bird will also be at Papamoa Library from 11.30am to 1.30pm on July 18.