As nouns the difference between terms and derotator
is that terms is while derotator is (astronomy) any optical, electronic or digital device that corrects for the rotation of an image or field of view as a telescope tracks.
terms
English
Noun
(head)
Statistics
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derotator
English
Noun
(
en noun)
(astronomy) Any optical, electronic or digital device that corrects for the rotation of an image or field of view as a telescope tracks