parallactic shift

parallactic shift

[¦par·ə¦lak·tik ′shift]
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When slightly tilting the label about a vertical axis, both the parallactic shift in the 2D/3D area and the exploding microtext (Figure 3) can be readily observed even under relatively diffuse illumination.
If you don't heed this rule and instead observe it at random altitudes east and west, differential atmospheric refraction between it and reference stars of other colors will put spurious deviations in your data and probably mask any parallactic shift.
Those refinements were soon forthcoming with the discovery, for example, that planetary orbits are elliptical rather than circular, and with the development of such instruments as the telescope, which enabled astronomers to make minute observations that proved the existence of parallactic shifts that were predicted by Copernicus and his followers.