Can I use 'when the moon is full at night,' 'during a full moon,' and 'on a full moon night' interchangeably in the sentence? Please enlighten me on this matter.
When the moon is full at night/during a full moon/on a full moon night, she goes to the cemetery.
They are all similar in meaning. The only difference is that "during a full moon" could mean daylight (however, you would not see a full moon in full daylight).
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They are all similar in meaning. The only difference is that "during a full moon" could mean daylight (however, you would not see a full moon in full daylight).
In my opinion all you need is "When the moon is full, she goes to the cemetery". (Your other two versions are both weaker.)
The reader will imagine this happening at night. He or she will not consult a textbook on astronomy for the technical definition.
CJ