there is a huge distance between the northern and the southern points of the territory. the northern-most island, ascension, is at latitude of the equator and the southern-most island, gough island is at . between st helena and tristan da cunha is the tropic of capricorn. the distance between the northern tip of ascension island and the southern tip of gough island is . the whole territory lies in the western hemisphere and has the same time zone: greenwich mean time. daylight saving time is not observed.