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We learn in Sanhedrin 48a:
ת"ש נפש שבנאו לשם חי מותר בהנאה הוסיף בו דימוס אחד לשם מת אסור בהנאה הכא במאי עסקינן דרמא ביה מת
Come and hear! A tomb built for a man still alive, may be used. If, however, one added a single row of stones for a dead person, no [other] use may be made thereof....
This question - How many days are there in each year of the 304th Metonic cycle? - and similar Metonic ones are being asked by the same user.
Can one simply point him to the relevant literature (e.g. https://en.wikipedia.org/wiki/Hebrew_calendar) and mark it as off-topic?
There's nothing "Jewis...
