| The first year of the current Julian period, or that of which the number in each of the three subordinate cycles is 1, was the year 4713 BC, and the noon of January 1 of that year, for the meridian of Alexandria, is the chronological epoch, to which all historical eras are most readily and intelligibly referred, by computing the number of integer days intervening between that epoch and the noon for Alexandria of the day, which is reckoned to be the first of the particular era in question | Our wide-ranging capabilities spanning all aspects of design, documentation, procurement, project management and installation enable us to offer select services as required or seamlessly deliver complete, end-to-end projects for our clients |
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| For example, the Julian day number for the day starting at 12:00 noon on January 1, 2000, was 2 451 545 | Outstanding results delivered safely, efficiently and cost-effectively |
Ordinarily calculating the fractional portion of the JD is straightforward; the number of seconds that have elapsed in the day divided by the number of seconds in a day, 86,400.
| A summary of Collin's description is in a footnote | Astronomical calculations generally include a year 0, so these dates should be adjusted accordingly i |
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| In 1583 he used " Iulianam vocauimus: quia ad annum Iulianum duntaxat accomodata est | The astronomical day had begun at noon ever since chose to begin the days for his astronomical observations at noon |
The next Julian Period begins in the year AD 3268.
8| All variables are integer values, and the notation " a div b" indicates , and "mod a, b " denotes the | The American Ephemeris was the last to add a multi-year table, in 1925 with 2,000 years |
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| If it does not exist, we create it ourselves | The same table appears in Tables of Mercury by Joseph Winlock, without any other Julian days |
The date given is a Gregorian calendar date if it is October 15, 1582, or later, but a Julian calendar date if it is earlier.