Bows and genuflections

Q: It is my understanding you should genuflect to the Tabernacle as you are entering and leaving the church.  However, once Mass begins, the bow should be to the altar – not the Tabernacle. What church document states this?

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A: Here’s an article I wrote for our local NPM chapter: https://paulturner.org/wp-content/uploads/2020/02/NPM-Newsletter-Bows-and-Genuflections.pdf