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plate center

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plate center [′plāt ‚sen·tər]
(astronomy)
The point used as the origin of coordinates for measuring positions of stars on a photographic plate in photographic astrometry, ideally located on the optical axis of the telescope.


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As a consequence, pressure decays and volumetric shrinkage are definitively different: if the cavity did not deflect in our case the volumetric shrinkage in the plate center would be 5% instead of -3% and the plate would not be over-packed.
 
 
 
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