agh- / Indo-European roots
A day (considered as a span of time).Oldest form *ag̑h-, becoming *agh- in centum languages.
a. day; daisy, today from Old English dæg, day;
b. Landtag from Old High German tag, day;
c. dawn from Old English denominative dagian, to dawn. a-c all from Germanic *dagaz (with initial d- of obscure origin), day..
[Pokorny ā̆g̑her- 7.]