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on or towards the side of your body that is to the east when you are facing north
by ケンブリッジ英英辞典
(訳 あなたが北に向いたときに東側になる方)

your right side is the side with the hand that most people write with
by ロングマン英英辞典
(訳 ほとんどの人が文字を書く手のほうが右)

・・・英英辞典、もうちょっと頑張れよw