Happy New Year, and mind the leap second
That graph represents the teensy weensy difference over recent years between “real” solar system time and the time we oh-so-carefully keep with atomic clocks. As of this morning, real time—i.e. the mean sun dead south or north at noon (at the exact mid longitude of a time zone)—was 6/10ths of a second behind Coordinated Universal Time (UTC or Zulu). You see, relative to the atomic clocks, the earth…