follow Dictionary.com

Your favorite word could be our Word of the Day!

siderostat

[sid-er-uh-stat] /ˈsɪd ər əˌstæt/
noun
1.
a telescopic device for reflecting the light of a star in a constant direction, the chief component of which is a plane mirror turned by a clock mechanism to correct for the rotation of the earth.
Origin
1875-1880
1875-80; sidero-2 + -stat
Related forms
siderostatic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for siderostatic

siderostat

/ˈsaɪdərəʊˌstæt/
noun
1.
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
Derived Forms
siderostatic, adjective
Word Origin
C19: from sidero-, from Latin sidus a star + -stat, on the model of heliostat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Encyclopedia Article for siderostatic

siderostat

any of a class of astronomical instruments consisting of a flat mirror that is turned slowly by a motor to reflect a given region of the sky continuously into a fixed telescope. In the traditional siderostat, the mirror is rotated by a lever arm connected to a motor that turns at a rate of one revolution every 24 hours. This so-called Foucault siderostat provides a fixed but rotating image. In recent years the Foucault siderostat has been largely supplanted by the heliostat (q.v.), which is a polar siderostat, and by the coelostat (q.v.).

Learn more about siderostat with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Difficulty index for siderostat

Few English speakers likely know this word

Word Value for siderostatic

0
0
Scrabble Words With Friends