heliomicrometer

noun
he·​lio·​micrometer | \¦hēlē(ˌ)ō+\

Definition of heliomicrometer 

: an instrument for determining heliographic positions of spots and flocculi shown on direct photographs of the sun or on spectroheliograph plates

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History and Etymology for heliomicrometer

heli- entry 1 + micrometer

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