A new moon doesn't happen on a specific day of the week. It's a lunar phase that occurs roughly every 29.5 days (the length of a lunar cycle).

Here's why:

* Lunar Phases: The moon's phases are caused by the changing angles at which we see the sunlit portion of the moon from Earth.

* New Moon: A new moon happens when the moon is between the Earth and the Sun, meaning the sunlit side of the moon is facing away from Earth.

So, the day of the week a new moon occurs will vary depending on the specific month. You can use a lunar calendar to track the new moon phases.