How to play
Enter six digits as hours, minutes and seconds. Tap a box to replace a digit.
Use a valid time: 00:00:00–23:59:59.
Green: right digit, right place. Yellow: right digit elsewhere. Grey: absent or an extra copy.
The arrow compares the whole time: earlier or later on the same 24-hour day.
From the clock to the stars
Explore ancient clocks, 12- and 24-hour time, angles, deep time and what a distant observer would see when looking at Earth.
Read the time and base 60 deep dive →Why sixty? A friendly look at sexagesimal
Sixty has a useful party trick: it divides neatly by 2, 3, 4, 5 and 6. Handy when you want halves, thirds or quarters without a trail of fractions.
Seconds roll over at 60, and minutes do the same. After 00:59:59 comes 01:00:00. That carrying is the base 60 idea hiding in your clock.
An ordinary clock mixes systems: hours here run from 00 to 23, so this is a time game inspired by base 60, rather than three pure base 60 digits.
Angles share the habit: one degree contains 60 arcminutes, each with 60 arcseconds. A circle has 360 degrees.