During which time period is the union jack flown in port?

The union jack is traditionally flown in port during the period from 0800 to sunset. This timing aligns with naval customs that designate specific hours for flying colors, with the sunrise and sunset serving as natural markers for the beginning and end of the day's activities. In this context, flying the union jack from 0800 signals the commencement of formal recognition of the vessel's presence in port, while ensuring it is displayed during hours when visibility is optimal, typically when most activities are taking place.

This practice reflects both naval tradition and regulations designed to maintain uniformity and respect within the naval community, where the display of flags holds significant meaning. The choice of 0800 is practical, accounting for varying daylight hours across different seasons, yet ensuring that the jack is still flown during the day when it can be seen and appreciated.