Contrary to the thinking of some, which say the KJV can never be improved upon, there have been major advances in the understanding of language and the historical contexts of words since the 1600's.
Daniel's source has it right with the meaning of "parousia".
Another thing that has to be remembered is that Jesus didn't just cook up that phrase about "coming in the clouds of heaven" for that occasion with the disciples. It came from Daniel 7:13ff.
Lastly, it's not "all the nations of the earth" that mourn for what happens at the parousia, it's "all the TRIBES of the LAND" (probably the tribes of Israel itself).



