Time.hour in base 60 is weird in chapter 14.

[alchemistcai]

In chapter 14 section Prototype and patch,hour%60 is unusual, as hour is usually in base 12 or 24 or 10.

If 59:59:59 is valid,I think 159:59:59 is valid too.

The result is a valid time. We can do the same thing with hour and second, and encapsulate the whole process in a function.

def increment_time(time, hours, minutes, seconds):
    time.hour += hours
    time.minute += minutes
    time.second += seconds
    
    carry, time.second = divmod(time.second, 60)
    carry, time.minute = divmod(time.minute + carry, 60)
    carry, time.hour = divmod(time.hour + carry, 60) # weird

Related description in chapter 14 section Design-first development is strange too,as sexagesimal is mainly for minutes and seconds.

In this case, the insight is that we can think of a Time object as a three-digit number in base 60-- also known as sexagesimal

[AllenDowney]

Will fix. Thanks!