Deflection of The Vertical

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Deflection of The Vertical

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The angular difference, at any place, between the direction of plumb line (the vertical) and the perpendicular (the normal) to the reference spheroid. This difference seldom exceeds 30 seconds of arc. Also called station error. </dd>
When measured at the earth's surface the deflection of the vertical is equal to the angle between the geoid and the reference spheroid. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use