Tangent law (resultant of horizontal and vertical earth field components) (tan δ = B_V/B_H (angle of dip relation))

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tan δ = B_V/B_H (angle of dip relation)

What each symbol means

SymbolWhat it stands for
δAngle of dip / inclination
B_HHorizontal component of Earth's field
B_VVertical component

When to use this

Magnetometer/tangent galvanometer context; BH and BV perpendicular components.