a small page · for an irregular moment
a clock running in real utc · with a poem prepared in advance for the next civil insertion. press observe at any time to advance the clock and read it.
article · ix · the leap second
a second is inserted into the official record. nothing is moved aside. the calendar simply admits one extra page.
— from the noemic codex
the international earth rotation and reference systems service (iers) decides when leap seconds are inserted, based on the slow disagreement between earth's rotation and atomic time. the practice will end in or around 2035 by a resolution of the cgpm.
see also noemata · leap second · codex · midnight · calendar.