noun
solar telescope; helioscope
A telescope designed for observing the sun, often equipped with special filters. The term helioscope is less common in everyday English but may appear in technical contexts.
天文台に新しい太陽望遠鏡が設置された。
A new solar telescope was installed at the observatory.
Compound of 太陽 (taiyō, 'sun') + 望遠鏡 (bōenkyō, 'telescope').