A binary clock displaying 10:48:36
A binary clock is a clock which displays time in a binary number representation. Most binary clocks are digital, although analog varieties exist.
As of 2005, the most common binary clock is sold by ThinkGeek.com , and uses six columns of LEDs to represent zeros and ones. The bottom row in each column represents 1, with each row above representing higher powers of two, up to 23, or 8. To read each individual digit in the time, the user adds the values that each illuminated LED represents, then reads these from left to right. The first two columns represent the hour, the next two represent the minute, and the last two represent the second.
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