@GabrielDuquette Technically it's the equivalence class of 1 modulo 12: (...-23, -11, 1, 13, 25...)
@GabrielDuquette That is, it's the class {times that look like 1 o'clock on a clock dial}.
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@GabrielDuquette That is, it's the class {times that look like 1 o'clock on a clock dial}.