Where does “グリニッジ平均時” come from?

グリニッジ平均時 (Japanese) comes from Japanese グリニッジ, from English Greenwich, from Middle English Greenwich, from Old English Grēnawīċ, from Old English wīc, from German witz, from Middle High German witz, from Old High German wizzi — to see.

Ancestry of “グリニッジ平均時”, step by step

グリニッジ平均時 traces back through two separate lines of ancestry.

via Japanese グリニッジ

StepLanguageWordMeaning
1JapaneseグリニッジGreenwich
2EnglishGreenwichThe Greenwich meridian; the prime meridian
3Middle EnglishGreenwich
4Old EnglishGrēnawīċ
5Old Englishwīcdwelling place, abode; abode, dwelling-place;...
6Germanwitzjoke
7Middle High Germanwitz
8Old High Germanwizzi
9Proto-West Germanicwītīpunishment
10Proto-Germanicwitjąknowledge; reason; sense; understanding; wit
11Proto-Germanic*witaną
12Proto-Indo-Europeanwóydeto have seen, to know
13Proto-Indo-Europeanweyd-to see

via Japanese 平均時

StepLanguageWordMeaning
1Japanese平均時
Every word from Proto-Indo-European weyd-Every word from Proto-Indo-European wóydeEvery word from Proto-Germanic *witaną