siderostat


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siderostat

(ˈsaɪdərəʊˌstæt)
n
(Astronomy) an astronomical instrument consisting essentially of a plane mirror driven about two axes so that light from a celestial body, esp the sun, is reflected along a constant direction for a long period of time. See also heliostat Compare coelostat
[C19: from sidero-, from Latin sidus a star + -stat, on the model of heliostat]
ˌsideroˈstatic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The author's telescope is aimed into a siderostat mirror for shooting the eclipse, which explains its unusual pointing angle.
The mirroring device, called a single-mirror siderostat, had been invented in 1862 by the French physicist Leon Foucault.
In the final design, the telescope's key moving element was a flat, 2-meter silvered glass mirror 27 centimeters thick in a fork-mounted siderostat. It directed light into the 1.25-meter, f/48 objective and down a fixed tube.
The outgrowth of numerous discussions with other eclipse photographers, especially my colleague Roger Sinnott, and past experiences, it's a variant of a polar telescope fed by a siderostat. Since the scope's optical axis lies on an imaginary extension of the siderostat's polar axis, the mount has to be made for the latitude of the observing site.
I fashioned the siderostat around a polar drive scavenged from a broken German equatorial mount made by Carson Telescopes.
The individual "siderostat" telescopes will be movable to keep the light path stable to about 10 angstroms.
This pair of early A dwarfs, first noted at Narrabri (Hanbury Brown et al 1974) has now been resolved using the VINCI instrument and two of the VLTI siderostats (Kellerer 2008).
Navy's prototype optical interferometer (NPOI) consists of a movable set of telescopes and siderostats. Siderostats are simply movable flat mirrors that redirect light to a central location where beams from separate mirrors may be combined.