Obv he knows it's a game type whoever responded below like a turd trying to explain it. Come on dude, he is asking why should it be there period if not available. They will drop on days that make it impossible. Doesn't make sense since they refresh daily.
This is obv a glitch bungie needs to know about and fix this
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there are always people who think they are too clever. just ignore them, thats what I do :P