Hesperian

Dictionary: Hes·pe·ri·an   (hĕ-spîr'ē-ən)

Of or relating to the west.

[From Latin Hesperius, from Greek hesperios, of the evening, western, from hesperos, evening.]

The adjective has one meaning:

Meaning #1: denoting or characteristic of countries of Europe and the Western Hemisphere
  Synonym: occidental