heliostat

noun

he·​lio·​stat ˈhē-lē-ə-ˌstat How to pronounce heliostat (audio)
: an instrument consisting of a mirror mounted on an axis moved by clockwork by which a sunbeam is steadily reflected in one direction

Examples of heliostat in a Sentence

Recent Examples on the Web
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Known as the Ivanpah Solar Electric Generating System, the facility consists of three different towers surrounded by heliostat arrays and has a capacity of 392 megawatts. Michael Franco, New Atlas, 17 July 2024 Known as solar thermal or concentrated solar power (CSP), these systems rely on mirrors known as heliostats to bounce sunlight to a central gathering point. Michael Franco, New Atlas, 17 July 2024 During the event, two heliostats with moveable mirrors were used to direct images of the eclipsed Sun into a pair of horizontal telescopes. Rebecca Boyle, TIME, 8 Apr. 2024 On the roof of the Swiss Federal Institute of Technology, this heliostat array focuses sunlight on a reactor that can turn carbon dioxide from the air into fuel. Frank Swain, Discover Magazine, 13 June 2020 The furnace’s heliostat, a 40-foot-wide panel of 36 mirrors (not visible here), tracks the sun across the sky, reflecting light into the attenuator (1), a grate that can be opened or closed like a window blind. Danielle Egan, Discover Magazine, 16 Dec. 2010 Placing three heliostats, spaced every 120 degrees along a crater rim would ensure steady illumination to the mine, and two more would beam light at the vapor capture tent and fuel processing plant, according to Sowers. Joe Pappalardo, Popular Mechanics, 27 Apr. 2020 But those peak around 1,000 degrees, because each heliostat has to be individually calibrated and can fall out of alignment over time. Laura Mallonee, Wired, 21 Jan. 2020 The researchers found that for a solar plant with a central tower, the efficiency of the heliostats closest to the tower was higher. Shweta Narayan, Smithsonian, 31 Aug. 2019

Word History

Etymology

New Latin heliostata, from heli- entry 1 + Greek -statēs -stat

First Known Use

1747, in the meaning defined above

Time Traveler
The first known use of heliostat was in 1747

Dictionary Entries Near heliostat

Cite this Entry

“Heliostat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliostat. Accessed 22 Nov. 2024.

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