(a) an instrument which photographs the sun using light of a particular wavelength, esp. that of the Balmer α emission line of hydrogen; †(b) a…
| 单词 | θ1463 |
| 释义 | the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > sun > photograph (2) spectroheliograph1892 (a) an instrument which photographs the sun using light of a particular wavelength, esp. that of the Balmer α emission line of hydrogen; †(b) a… spectroheliogram1905 a photograph obtained with a spectroheliograph. |
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