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  2. Binary clock - Wikipedia

    en.wikipedia.org/wiki/Binary_clock

    Reading a binary-coded decimal clock: Add the values of each column of LEDs to get six decimal digits. There are two columns each for hours, minutes and seconds. Both clocks read 12:15:45. Most common binary clocks use six columns of LEDs to represent zeros and ones.

  3. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    This property also makes it straightforward to represent a timestamp as a fractional day, so that 2025-01-30.54321 can be interpreted as five decimal hours, 43 decimal minutes and 21 decimal seconds after the start of that day, or a fraction of 0.54321 (54.321%) through that day (which is shortly after traditional 13:00).

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Babylonian numerals and Sumerian; degrees-minutes-seconds and hours-minutes-seconds measurement systems; Ekari; covers base 62 apart from I, O, and l, but including _(underscore). [64] 62: Can be notated with the digits 0–9 and the cased letters A–Z and a–z of the English alphabet. 64: Tetrasexagesimal: I Ching in China.

  5. Second - Wikipedia

    en.wikipedia.org/wiki/Second

    Fractions of a second are usually denoted in decimal notation, for example 2.01 seconds, or two and one hundredth seconds. Multiples of seconds are usually expressed as minutes and seconds, or hours, minutes and seconds of clock time, separated by colons, such as 11:23:24, or 45:23 (the latter notation can give rise to ambiguity, because the ...

  6. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    In the mid-1960s, to defeat the advantage of the recently introduced computers for the then popular rally racing in the Midwest, competition lag times in a few events were given in centids (1 ⁄ 100 day, 864 seconds, 14.4 minutes), millids (1 ⁄ 1,000 day, 86.4 seconds), and centims (1 ⁄ 100 minute, 0.6 seconds) the latter two looking and ...

  7. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    According to its author, it can compute one million digits in 3.5 seconds on a 2.4 GHz Pentium 4. [100] PiFast can also compute other irrational numbers like e and √ 2 . It can also work at lesser efficiency with very little memory (down to a few tens of megabytes to compute well over a billion (10 9 ) digits).

  8. Taqi ad-Din Muhammad ibn Ma'ruf - Wikipedia

    en.wikipedia.org/wiki/Taqi_ad-Din_Muhammad_ibn_Ma...

    These tables placed the ecliptic at 23° 28' 40". The current value was 23° 27' showing that al-Dīn's instruments and methods were more precise. Al-Dīn used a new method to calculate solar parameters and to determine the magnitude of the annual movement of the sun's apogee as 63 seconds. The known value today is 61 seconds.