When DST is introduced does it mean that the sun is in zenith one hour later (1pm winter local time) or one hour earlier (11am winter local time)?
Edit: The location is New York.
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In general, daylight saving time (DST) is not used in the winter. In New York, DST is used in spring, summer, and fall. (Since the start date was changed from April to March, technically DST does begin before winter ends.)
If the Sun is on the meridian at noon local time (and at its highest point), that would correspond to 1 pm DST.