Renko Usami (宇佐見 蓮子 Usami Renko) is one of the main protagonists in the attached stories of ZUN's Music Collection. She is a university student in the near future of the Outside World in Kyoto, who forms the "Hifuu Club" along with her close friend Maribel Hearn. She has no relation to Gensokyo, but is aware of it through Maribel talking about her visits to it in her dreams.
Renko is generally portrayed as being a confident person with an adventurous and daring personality. Being a physics major, she also tends to view things from a more objective point of view.
Her personality makes her a great support for Maribel. For example, the club's activities are usually arranged by her such as their trip to Rendaino in Ghostly Field Club as well as to the "Old Adam" bar in Dateless Bar "Old Adam". Her more objective view on things also allows her to help Maribel differentiate between reality and fantasy. However, this does not stop Renko from believing in anything that Maribel says.
Telling time by the stars and determining location by the Moon
Renko is able to tell time by looking at the stars and determine location by looking at the Moon. Her ability is shown to work even when looking at a snapshot of the stars and Moon. She was able to determine the location of a photo of an entrance to the Netherworld by simply looking at the Moon and stars pictured.
However, her ability to tell time by looking at the stars is limited to Japanese Standard Time (JST). If she wanted to know the time in another timezone, she would have to do the necessary calculation.
(https://en.touhouwiki.net/wiki/Renko_Usami)
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