Looking behind What is a year? A measure of time, counted out second by second? A measure of distance, a complete journey around the sun? A changing of the seasons, from Winter to Spring to Summer to Autumn and back to Winter? A new page number in the history books, from 2018 to 2019? New years arrive on a strict timetable, like clockwork: precisely one every year. It couldn’t happen any other way, for a year is exactly one year long. Years are cyclical. Temperatures are fall