I find many nodes for calculating the current moon phase, but none that gives me the date and time of the next full moon / new moon at a given geo location.
I know nothing about astronomy (but I do like Space & the film interstellar 
)
This type of data, is usually harvested from API's.
A quick search yields
it shouldn't be too difficult to create a set of nodes to grab the data using the HTTP Request Node.
not sure if these are paid access services
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Maybe raise a request against this node to see if redmatic would be interested in adding that.
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Thanks!
Meteomatics would require a payed subscription. So I will use the following API which is free and also provides the required data: https://aa.usno.navy.mil/data/MoonPhases
Here is a solution, using the free API that I mentioned above:
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