Henderson’s Extra-Territorial Jurisdiction is one of those great mysteries in life. Extending 1.5 miles beyond the city limits, the ETJ covers an area larger than the city itself, and there’s perpetual public confusion about what city laws do and don’t apply in that zone. Henderson has the power to enforce more types of ordinances in the ETJ than it does; the city basically limits itself to planning and zoning authority. That authority will be on display today at 3:30 p.m. in the Municipal Building, where all five public hearings before the Zoning Board of Adjustment involve the ETJ. On the agenda are a new 12,600-square-foot auto-repair building for C&P Body Shop on Raleigh Road, a planned unified business development (the category for shopping centers) on 1.936 acres on Warrenton Road, a day care center on Eastern Boulevard, a mobile home on Farm Street and a Raleigh Road residence/business that has violated setback requirements.