Different Text for every New Moon

I'm trying to put different single word every time it's New Moon $ai(mage)=1$

For example: I have 6 words. (1) Ab (2) Bc (3) Cd (4) De (5) Ef (6) Fg
If I start from next New Moon I want to show Ab on my screen and then Bc for the next New Moon and so on. After the 6th New Moon I want to show Ab again on 7th New Moon and repeat the process.
To clarify, I wanna put different text on every Lunar Cycle. And after the 6th Lunar Cycle I wanna repeat those 6 words from the 7th Lunar Cycle. And I'd love it if it can be done automatically.

Is it possible ? How ?

Thanks in advance.