How to interpret the result
In a constructed month, the Mercury note might read retrograde from the 18th at 14:05 local time, with the end time falling after the month closes. That leaves the 1st to the 17th outside the interval, and the station day itself is split: the morning of the 18th comes before the station and the late afternoon after it. The page reminds you that station times apply within that date, not to every hour of it.
