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  2. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    This determines the number of days between two coupon payments, thus calculating the amount transferred on payment dates and also the accrued interest for dates between payments. [1] The day count is also used to quantify periods of time when discounting a cash-flow to its present value. When a security such as a bond is sold between interest ...

  3. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    The equation of time describes the discrepancy between two kinds of solar time. The two times that differ are the apparent solar time , which directly tracks the diurnal motion of the Sun , and mean solar time , which tracks a theoretical mean Sun with uniform motion along the celestial equator .

  4. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.

  5. Sunrise equation - Wikipedia

    en.wikipedia.org/wiki/Sunrise_equation

    A contour plot of the hours of daylight as a function of latitude and day of the year, using the most accurate models described in this article. It can be seen that the area of constant day and constant night reach up to the polar circles (here labeled "Anta. c." and "Arct. c."), which is a consequence of the earth's inclination.

  6. Decay correction - Wikipedia

    en.wikipedia.org/wiki/Decay_correction

    The decay correct might be used this way: a group of 20 animals is injected with a compound of interest on a Monday at 10:00 a.m. The compound is chemically joined to the isotope copper-64, which has a known half-life of 12.7 hours, or 764 minutes.

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  8. Day - Wikipedia

    en.wikipedia.org/wiki/Day

    It uses the day as the base unit, and smaller units being fractions of a day: a metric hour (deci) is 1 ⁄ 10 of a day; a metric minute (milli) is 1 ⁄ 1000 of a day; etc. [16] Similarly, in decimal time, the length of a day is static to normal time. A day is also split into 10 hours, and 10 days comprise a décade – the equivalent of a ...

  9. Relative hour - Wikipedia

    en.wikipedia.org/wiki/Relative_hour

    Rabbi Pinchas said in the name of Rabbi Abba bar Pappa: One star is certainly day; two [stars] is a doubtful case; three [stars] is certainly night. [23] The precise, intermediate time between day and night, or what is termed in Hebrew bayn ha-sh'meshot, has been discussed by Talmudic scholars in great detail. Some describe the time as when the ...