parallax method

par·al·lax meth·od

localization of a foreign body by observing the direction of its motion on a fluoroscopic screen while moving the x-ray tube or the screen.
References in periodicals archive ?
However, the parallax method can only be applied for stars which are reasonably close to us, since beyond distances of 1600 light years, the angles of inclination are too small to be measured by the Hipparcos satellite, a precursor to Gaia.
The parallax method is feasible only if the basis is not too small with respect to the distance of the object.