As nouns the difference between derotator and denotator
is that 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 while denotator is that which denotates.
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