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From this moment forth, the night will last forever!
Could you tell me how forth function in the sentence? It looks like just "from this moment" makes sense in the sentence. In other words, are there any differences between "From this moment forth," and "From this moment,"? Thanks in advance!

The transcription and context is available in http://mlp.wikia.com/wiki/Transcripts/Friendship_is_Magic,_part_1
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PonyFanCould you tell me how forth function in the sentence?
It is an adverb—onward in time, in order, or in a series: from that day forth.
PonyFanare there any differences between "From this moment forth," and "From this moment,"?
Not really; I think 'forth' just adds a note of grandeur.
Comments  

It serves the same function as if you wouldve switched it out with "on" or "forward", it literally means forward.