The reason for the east facing position is offered by Tom Kunesh:
Note that in Christianity, the star that led the wise men to Jesus comes from the east. Then there is Matthew 24:27 (NKJ): “For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be ...” thus for the Christian believer in the resurrection of the dead, placing the body facing east will allow the dead to see the Second Coming of Jesus.
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