siderostatn.
/ˈsʌɪd(ə)rə(ʊ)stat/, /ˈsɪd(ə)rə(ʊ)stat/, U.S. /ˈsaɪdərəˌstæt/, /ˈsɪdərəˌstæt/ Astronomy.
A flat mirror mounted and slowly rotated to compensate for the diurnal rotation of the celestial sphere, so that light from a celestial object under observation is directed to the same position in a telescope, detector, etc. Also siderostat mirror.
ΘΚΠ
the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > stars
astrometer1783
astrophanometer?1810
scintillometer1861
astrophotometer1866
siderostat1868
wedge-photometer1883
scintilloscope1890
1868 Index Foreign Sci. Periodicals 3 Apr. 97 Description of L. Foucault's Siderostat.
1890 Philos. Mag. 29 42 The siderostat-mirror has been so placed as to be sending towards the bolometer radiations from the sky on the east of the moon.
1983 R. Kingslake Optical Syst. Design ix. 150 The siderostat can be mounted at the top of the telescope, as has been done in the large McMath solar telescope on Kitt Peak.
2015 S. K. Saha High Resol. Imaging iii. 150 Four telescopes, each comprising a 50 cm siderostat mirror that feed a fixed horizontal 40 cm Cassegrain telescope..are arranged in a Y-layout.
Derivatives
ˌsideroˈstatic adj. equipped with or employing a siderostat.
ΘΚΠ
the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [adjective] > stars
siderostatic1879
spectroheliographic1905
1879 Proc. Royal Soc. Dublin 2 361 The Siderostatic Telescope..is principally intended for solar spectroscopic investigation.
1901 Jrnl. Brit. Astron. Assoc. 11 271 Photographs were not impossible with a long focus telescope, mounted on the..siderostatic form, in a favourable climate.
1995 Adv. in Space Res. 16 48 One and the same reference mask may be applied for a long time interval if siderostatic tracking is used.
This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022).
<
n.1868