photoheliograph
- noun
- /ˌfoʊtoʊˈhiːliəˌɡræf/
- Archaic
- A specialized photoheliograph was installed to document changes on the Sun's surface over time.
Examples
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In the nineteenth century, astronomers relied on the photoheliograph for systematic solar observations.
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The observatory used a photoheliograph to capture detailed images of sunspot activity.
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The photoheliograph captured stunning images of the solar eclipse.
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Scientists use a photoheliograph to study solar flares.
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The observatory used a photoheliograph to capture stunning images of the solar eclipse.
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A state-of-the-art photoheliograph allowed scientists to study the Sun's surface in detail.
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During the workshop, participants learned how to operate a photoheliograph for solar photography.
Synonyms
A machine that takes pictures of the Sun using one color of light to show details
A telescope for safely looking at the sun to study sunspots and flares
Surface Forms
Morphology
photoheliograph = heliograph (semi-transparent) = photo + helio + graph
The step from 'heliograph' to 'photoheliograph' is partly understandable, but the exact specialized telescope-and-camera meaning is not fully predictable for most learners.
Etymology
Photoheliograph comes from three parts: photo- meaning 'light', helio- meaning 'sun', and -graph meaning 'to write' or 'record', the same photo- you see in photograph. So a photoheliograph literally means a machine that 'records the sun with light', in other words a camera for taking pictures of the Sun.