Zhenya took a close look at the object, and frowned. Hmm... she had seen it at her grandparents house... yes, but wasn't 100% sure about the use of it. Anyway, not to matter, she raised her hand and said "Professor... that's a nocturnal, a type of instrument used during the night. I think it's similar to the Sundial but instead of requiring the positioning of the sun, the nocturnal requites a position of a star to determine the time," she said. Then she had some other information, "It's a good instrument to use during navigation. But Professor, with this instrument does it work on a certain star, or can it work on any star?" she asked.