| This error can be reduced substantially by choosing the coelostat position and time interval. |
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| Back in Ottawa, a specially designed shed with a roll off section housed the coelostat for almost 70 years. |
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| Moreover, the light reflected by the coelostat is partially polarized, and the amount and character of polarization depends on the incidence angle. |
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| In recent years the Foucault siderostat has been largely supplanted by the heliostat, which is a polar siderostat, and by the coelostat. |
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| The silvered mirrors of the coelostat were pointed to some of the brighter stars beginning in 1905, and the first large-scale spectra of other stars were obtained. |
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| He promoted astronomy with the invention of the coelostat, a device which immobilise the image of a star and its neighbouring stars so that a photograph can be taken. |
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| At Boyden Observatory near Bloemfontein, there is a 20-cm coelostat with instrumentation for making narrow-band Ha observations. |
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