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| Calendar (double jd) |
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virtual void | retranslate ()=0 |
| | Translate e.g. stringlists of part names.
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virtual void | setJD (double JD)=0 |
| | Set a calendar date from the Julian day number Subclasses set JD and compute the parts and possibly other data This triggers the partsChanged() signal.
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virtual double | getJD () const |
| | Get Julian day number from a calendar date.
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| virtual void | setDate (QVector< int > parts)=0 |
| | set date from a vector of calendar date elements sorted from the largest to the smallest. More...
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| virtual QVector< int > | getDate () const |
| | get a vector of calendar date elements sorted from the largest to the smallest. More...
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| virtual QStringList | getDateStrings () const =0 |
| | get a stringlist of calendar date elements sorted from the largest to the smallest. More...
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virtual QString | getFormattedDateString () const |
| | get a formatted complete string for a date. The default implementation just concatenates all strings from getDateStrings() with a space in between.
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int | rdCorrSum (QVector< int >factors, int corr) |
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| static double | momentFromJD (double jd, bool respectUTCoffset=true) |
| | Interfacing function from Reingold/Dershowitz: Calendrical Calculations Returns a "moment" in RD that represents JD. More...
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static int | fixedFromMoment (double rd) |
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static double | timeFromMoment (double rd) |
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| static int | fixedFromJD (double jd, bool respectUTCoffset=true) |
| | Interfacing function from Reingold/Dershowitz: Calendrical Calculations Returns a fixed date in RD that represents noon of JD. More...
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static double | momentFromMJD (double mjd) |
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| static double | jdFromMoment (double rd, bool respectUTCoffset=true) |
| | interfacing function from Reingold/Dershowitz: Calendrical Calculations Returns a JD from an RD "moment" (including fractions of day) Stellarium extension: optionally includes local time zone offset. More...
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| static double | jdFromFixed (double rd, bool respectUTCoffset=true) |
| | interfacing function from Reingold/Dershowitz: Calendrical Calculations Returns a JD from an RD "moment" (including fractions of day) Stellarium extension: optionally includes local time zone offset. More...
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static double | mjdFromFixed (double rd) |
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static int | dayOfWeekFromFixed (int rd) |
| | weekday from RD date. CC.UE(1.60).
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static int | kdayOnOrBefore (const Calendar::Day k, const int rd) |
| | the R.D. of the nearest weekday k on or before rd
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static int | kdayOnOrAfter (const Calendar::Day k, const int rd) |
| | the R.D. of the nearest weekday k on or after rd
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static int | kdayNearest (const Calendar::Day k, const int rd) |
| | the R.D. of the nearest weekday k around rd
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static int | kdayBefore (const Calendar::Day k, const int rd) |
| | the R.D. of the nearest weekday k before rd
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static int | kdayAfter (const Calendar::Day k, const int rd) |
| | the R.D. of the nearest weekday k after rd
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| static double | modInterval (double x, double a, double b) |
| | Interval modulus, CC.UE 1.24. More...
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static int | modInterval (int x, int a, int b) |
| | Interval modulus, CC.UE 1.24: This EXCLUDES the upper limit! Use StelUtils::amod(x, b) for CC's (x)mod[1..b].
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static int | rdCorrSum (QVector< int >parts, QVector< int >factors, int corr) |
| | Reingold-Dershowitz CC.UE 1.48.
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static QVector< int > | toRadix (int num, QVector< int >radix) |
| | Split integer to mixed-radix vector. Reingold-Dershowitz CC.UE 1.42.
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Stellarium uses Julian Day numbers internally, and the conventional approach of using the Gregorian calendar for dates after 1582-10-15. For dates before that, the Julian calendar is used, in the form finalized by Augustus and running unchanged since 8AD. Astronomical year counting implies having a year 0, while some calendars adhere to historical counting like 1 B.C., 1 A.D. Some European countries, especially the Protestant countries, delayed the calendar switch well into the 18th century. Other cultures have various other calendar schemes. All calendars have a numerical vector of time elements and may have individual string lists for names of elements like "week days" and "months". If the pattern of weeks and months does not apply, the names may refer to other structural elements.
The most important source used here is: Edward M. Reingold, Nachum Dershowitz: Calendrical Calculations in various editions (1997-2018), referred to as CC. In particular CC.ME=2nd "Millennium edition", CC.UE=4th "Ultimate Edition" It describes the Gregorian calendar with year zero, and the Julian without. In this plugin only, we adhere to this convention to finally have all possible variations of dates. It does not use JD directly but a number called Rata Die (RD=JD-1721424.5), a day count starting at midnight of January 1st, 1 AD (Proleptic Gregorian). with functions including "fixed" in their names. Our calendar subclasses can use Calendar::fixedFromJD(jd) / Calendar::jdFromFixed(rd).
1.8.13