cheonche gwangdogye
astrophotometer
astrophotomètre
천체 광도계를 사용하여 별의 밝기를 측정할 수 있습니다.
cheontae gwangdogye-reul sayonghayeo byeol-ui balgireul cheugjeonghal su itsseumnida.
You can measure the brightness of stars using an astrophotometer.
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