I Became the Empress Dowager of Qin

As the title says. I'm in the Warring States period, born in Zhao. When I was born, Wei Wuji was enfeoffed as Lord Xinling. What year is this? How long until the Battle of Changping? Please answer quickly, it's urgent! This was originally posted as The Quiet Joy of the Mortal World, but it wouldn't show up. I posted it again, so the same book ended up posted twice. Deleting it proved difficult, so I used this title instead. Irregular updates, just practicing my writing? Probably a story about a bold, uninhibited beauty and her seemingly gentle but secretly ruthless man. It's tagged as romance, and I can't seem to change it. The romantic storyline may be barely there? If that bothers you, read at your own risk. Warnings: One-on-one pairing, the male lead is Yiren, no third-party perspective. The heroine isn't adored by everyone, even though she's pretty. The heroine probably isn't a strong, independent female lead. My writing ability is limited, and if I force it, it might come out awkwardly. The heroine has no golden finger: no System, cultivation, superpowers, mind-reading, pocket dimension... The heroine isn't a history buff or scholar. Before Ying Zheng's birth, she can barely reconcile the Warring States rulers' reign dates with the Gregorian calendar. Theme: Like the waxing moon, like the rising sun.