Functions to handle time.
Functions to handle time.
(date-to-julian-day year month day)
Calculates the julian day for the date given by year, month and day.
Calculates the julian day for the date given by year, month and day.
(date-to-milliseconds date)
Returns the milliseconds since 1970-01-01 00:00:00.000 for a platform date
Returns the milliseconds since 1970-01-01 00:00:00.000 for a platform date
(day-of-week jd)
Calculates the index of the day in the week for the given julian day instant.
Calculates the index of the day in the week for the given julian day instant.
(day-of-year jd)
(day-of-year year month day)
Calculates the index of the day in the year for the given julian day instant.
Calculates the index of the day in the year for the given julian day instant.
(delta-t-meeus year)
Calculates Delta T after the formulars given in Astronomical Algorithms.
Calculates Delta T after the formulars given in Astronomical Algorithms.
(delta-t-nasa year month)
Calculates Delta T after the formulars given on the web page 'Polynomial Expressions for Delta T (ΔT)'.
Calculates Delta T after the formulars given on the web page 'Polynomial Expressions for Delta T (ΔT)'.
(dynamic-time-to-universal-time year td)
Calculates the universal time by for the dynamic time.
Calculates the universal time by for the dynamic time.
(easter-date year)
Calculates the easter date for the given year.
Calculates the easter date for the given year.
(easter-date-by-gregorian-date year)
Calculates the easter date for the given year in the gregorian calender.
Calculates the easter date for the given year in the gregorian calender.
(easter-date-by-julian-date year)
Calculates the easter date for the given year in the julian calender.
Calculates the easter date for the given year in the julian calender.
(easter-date-by-julian-day jd)
Calculates the easter date for the year of the julian day.
Calculates the easter date for the year of the julian day.
Protocol for Epochs.
Protocol for Epochs.
(to-bessel-epoch this)
(to-bessel-epoch this year)
(to-bessel-epoch this year type)
(to-julian-epoch this)
(to-julian-epoch this year)
(to-julian-epoch this year type)
(gregorian-date-to-julian-day year month day)
Calculates the julian day for the date given by year, month and day using the gregorian calender.
Calculates the julian day for the date given by year, month and day using the gregorian calender.
(gregorian-leap-year? year)
Returns true if the given year is a leap year in the gregorian calender.
Returns true if the given year is a leap year in the gregorian calender.
(as-date date)
(as-julian-day date)
Returns the julian day of this point in time.
Returns the julian day of this point in time.
(julian-centuries jd)
(julian-centuries jd epoch)
Calculates the julian centuries since the epoch (default J2000.0).
Calculates the julian centuries since the epoch (default J2000.0).
(julian-date-to-julian-day year month day)
Calculates the julian day for the date given by year, month and day using the julian calender.
Calculates the julian day for the date given by year, month and day using the julian calender.
(julian-day y m d b)
Calculates the julian day from a calender date.
Calculates the julian day from a calender date.
(julian-day-of-bessel-year bessel-year)
Calculates the julian day of the beginning of the given bessel year.
Calculates the julian day of the beginning of the given bessel year.
(julian-day-of-julian-year julian-year)
Calculates the julian day of the beginning of the given bessel year.
Calculates the julian day of the beginning of the given bessel year.
(julian-day-to-date jd)
Calculates the calender date of the julian day instant.
Calculates the calender date of the julian day instant.
(julian-ephemeris-day jd)
Calculates the julian ephemeris day (JDE) from the given julian day instant.
Calculates the julian ephemeris day (JDE) from the given julian day instant.
(julian-leap-year? year)
Returns true if the given year is a leap year in the julian calender.
Returns true if the given year is a leap year in the julian calender.
(leap-year-by-julian-day? jd)
Returns true if the year of the given julian day instant is a leap year in the gregorian calender.
Returns true if the year of the given julian day instant is a leap year in the gregorian calender.
(leap-year? year)
Returns true if the given year is a leap year.
Returns true if the given year is a leap year.
(mean-siderial-time-greenwich jd)
Calculates the mean sidereal time in degrees at greenwich for the given instant in UT.
Calculates the mean sidereal time in degrees at greenwich for the given instant in UT.
(mean-siderial-time-greenwich-0ut jd)
Calculates the mean sidereal time in degrees at greenwich at 0h UT.
Calculates the mean sidereal time in degrees at greenwich at 0h UT.
(milliseconds-to-julian-day ms)
Calculates the julian day for the milliseconds since 1970-01-01 00:00:00.000.
Calculates the julian day for the milliseconds since 1970-01-01 00:00:00.000.
(modified-julian-day jd)
Calculates the modified julian day from the julian day
Calculates the modified julian day from the julian day
(new-julian-day)
(new-julian-day date)
Creates a new julian day instant.
Creates a new julian day instant.
(now-ms)
Returns the current time in milliseconds since 1970-01-01 00:00:00.000.
Returns the current time in milliseconds since 1970-01-01 00:00:00.000.
(time-by-julian-day jd)
Calculates the time for the given julian day instant.
Calculates the time for the given julian day instant.
(time-of-day day)
Calculates the time in hours, minutes and seconds for the given decimal day.
Calculates the time in hours, minutes and seconds for the given decimal day.
(universal-time-to-dynamic-time year ut)
Calculates the dynamic time by for the universal time.
Calculates the dynamic time by for the universal time.
(year jd)
Calculates the year of the julian day instant
Calculates the year of the julian day instant
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