Emma will certainly not be able to tell! And it would not occur to her to ask mid-conversation. She shakes her head. "Welce, one sun," she says firmly. "Up, down, day. Nine day, um... nineday." That seems obvious, when said like that, but whatever, that's its name. "Eight nineday, quintile. Five quintile, year."

She does not need to explain changedays right now, that seems unnecessarily complicated.