I have just found "Blade of Crota" hive knight on earth, then i looked around and found another two "Ritual" spots where they spawned. THEN out of curiosity i went to the moon and did it again. I have video proof and will post it momentarily (as soon as i figure out how to download the video) if you want to check it out go to the gamertag Palido Tigre and watch my videos.
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It's meant to happen now. Nothing special.
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Its been happening on the moon and on earth every 7 minutes for the past couple of days till December 9th.