We all accept that time zones are totally normal, but they're pretty weird. For some reason, we've all agreed that when you go over certain lines on the globe, not only might you be in a new place, but your time will be different too.

K is for Kepler

Truth is the daughter of time, and I feel no shame in being her midwife. These words, written by Johannes Kepler in 1611, are profound.  At the time, Galileo had just discovered the Galilean moons (including Europa) in Florence but was being persecuted for his belief that the Earth orbits the sun.  Kepler, a staunch supporter of heliocentrism, …