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  2. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    ≡ 2.54 cm ≡ 1 ⁄ 36 yd ≡ 1 ⁄ 12 ft ≡ 0.0254 m league (land) lea ≈ 1 hour walk, Currently defined in US as 3 Statute miles, [3] but historically varied from 2 to 9 km ≈ 4828 m: light-day: ≡ 24 light-hours ≡ 2.590 206 837 12 × 10 13 m: light-hour: ≡ 60 light-minutes ≡ 1.079 252 8488 × 10 12 m: light-minute: ≡ 60 light ...

  3. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    Since there are about 365 days in a year, there are about ⁠ 365 / 10 ⁠ = 36.5 days in a tenth of a year. Hence the year 2020.5 represents the day 2 July 2020. [22] More exactly, a "Julian year" is exactly 365.25 days long, so a tenth of the year is 36.525 days (36 days, 12 hours, 36 minutes).

  4. Orders of magnitude (time) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(time)

    While this is strictly 24 hours and 1 second in conventional units, a digital clock of suitable capability level will most often display the leap second as 23:59:60 and not 24:00:00 before rolling over to 00:00:00 the next day, as though the last "minute" of the day were crammed with 61 seconds and not 60, and similarly the last "hour" 3601 s ...

  5. Carnegie Unit and Student Hour - Wikipedia

    en.wikipedia.org/wiki/Carnegie_Unit_and_Student_Hour

    However, further complicating the computation is the fact that American schools typically meet 180 days, or 36 academic weeks, a year. A semester (one-half of a full year) earns 1/2 a Carnegie Unit. [1] The Student Hour is approximately 12 hours of class or contact time, approximately 1/10 of the Carnegie Unit (as explained below).

  6. Kilowatt-hour - Wikipedia

    en.wikipedia.org/wiki/Kilowatt-hour

    This results in a 500 mA USB device running for about 3.7 hours on a 2,500 mAh battery, not five hours. The Board of Trade unit (B.T.U.) [ 17 ] is an obsolete UK synonym for kilowatt-hour. The term derives from the name of the Board of Trade which regulated the electricity industry until 1942 when the Ministry of Power took over. [ 18 ]

  7. Flight-time equivalent dose - Wikipedia

    en.wikipedia.org/wiki/Flight-time_equivalent_dose

    The flight-time equivalent dose concept is the creation of Ulf Stahmer, a Canadian professional engineer working in the field of radioactive materials transport. It was first presented in the poster session [1] at the 18th International Symposium of the Packaging and Transport of Radioactive Materials (PATRAM) held in Kobe, Hyogo, Japan where the poster received an Aoki Award for distinguished ...

  8. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    [5] [6] The Swedish conversion to the Gregorian calendar was finally accomplished in 1753, when February 17 was followed by March 1. [5] Artificial calendars may also have 30 days in February. For example, in a climate model the statistics may be simplified by having 12 months of 30 days. The Hadley Centre General Circulation Model is an ...

  9. Light-second - Wikipedia

    en.wikipedia.org/wiki/Light-second

    The perihelion of Saturn's orbit is about 1.25 light-hours light-day 24 light-hours = 86 400 light-seconds 25 902 068 371 200 m: 2.590 × 10 10 km: 1.609 × 10 10 miles: Voyager 1 is about 0.94 light-days from the Sun (as of April 2024) light-week 7 light-days = 604 800 light-seconds 181 314 478 598 400 m: 1.813 × 10 11 km: 1.127 × 10 11 miles