goniometer (noun)

1. During World War II, the military used goniometers to determine the angular direction of incoming radio signals and locate enemy positions.

2. The artist used a goniometer as a reference tool to accurately portray the direction of sunlight in the painting.

3. In the suspenseful thriller, the protagonist used a goniometer to trace the source of mysterious radio signals, leading to a pivotal plot twist.

4. Under a starry night sky, the couple used a goniometer to align their radio telescope and share a romantic moment stargazing together.