E hoʻomaopopo, aia i kēia manawa he uku e komo ai i ka pā e kū ma ke kele Meridian Line.
He hopena kiʻi kūikawā ia: e kiʻi i kāu kiʻi i kū ma luna o ke Prime Meridian Line ma Greenwich. ʻO ke poʻo o ka Royal Observatory a ma loko o ka pā hale he mea hao i kahi āu e kū nei ma ke laina a hiki i ka heʻe ma ka hikina a me ke komohana i ka manawa like. Ua kohoʻiaʻo Greenwich i ka makahiki 1884 ma keʻano he Prime Meridian o ke ao, Longitude Zero (0 ° 0 '0 ").
Ke anaʻia kēlā me kēia wahi ma ka Honua ma keʻano o kona kihi ma ka hikina a ma ke komohana mai kēia laina (longitude), e like me ka hoʻokaʻawaleʻana o ka'Equator i ka'ākau a me ka hema (latitude).
ʻO kekahi leʻaleʻa punahele'ē aʻe oiaiʻoe e hele ana e nānā i ka Time Ball ma luna o ka hale Flamsteed hāʻule i ka 1pm i nā lā a pau. Ma ka hola 12.55pm, piʻi ka pō leʻa i luna o ka mast. Ma 12.58pm ka piʻiʻana i luna, a ma ka hola 1pm, ua hāʻule ka pōlepele, a hāʻawiʻia i hōʻailona no ka holoʻana o nā moku a me nā mea'ē aʻe e nānā.
Eʻike i ka huakaʻi Greenwich no nā kiko'ī hou aku.
Ināʻaʻole i lawa ka piʻiʻana i ka mauna ma Greenwich Park a hiki i ka Royal Observatory a no ka makemake i kahi piʻiʻoluʻoluʻole e noʻonoʻo e piʻi i luna o O2 i Up ma The O2 ?