Ramuh.Dasva said:
If by research you mean reading the text on the item then yes you should do your research.
Again, stop being a ***, it was a simple question about an advanced piece of gear. Did you ever stop to think that maybe this person is new to 75 summoner, and probably doesn't have blm either, so maybe, just maybe, they're doing some research by asking a perfectly reasonable question before spending hours in sea farming for their obis, only to find they don't work as expected.
Because hey, "Gain Full Effect of Earthsday/Earth Weather Bonuses" totally explains that it only applies ON earthsday or earth weather. From an avatar perpetuation cost point of view there's no random element in day/weather bonus as there is for elemental magic. Just because you've known something for a long time doesn't actually mean that it's common knowledge to someone who's never had a need for them.