Functions related to calendar and time conversions.
swe_julday(year, month, day, hourd, gregflag)
swe_date_conversion(year, month, day, hourd, cal)
swe_revjul(jd, gregflag)
swe_utc_time_zone(year, month, day, houri, min, sec, d_timezone)
swe_utc_to_jd(year, month, day, houri, min, sec, gregflag)
swe_jdet_to_utc(jd_et, gregflag)
swe_jdut1_to_utc(jd_ut, gregflag)
swe_time_equ(jd_ut)
swe_lmt_to_lat(jd_lmt, geolon)
swe_lat_to_lmt(jd_lat, geolon)Astronomical year as integer
Month as integer
Day as integer
Hour as double
Calendar type as integer (SE$JUL_CAL=0 or SE$GREG_CAL=1)
Calendar type "g" [Gregorian] or "j" [Julian] as char
Julian day number as double
Hour as integer
min as integer
Second as double
Timezone offset as double (hour)
Julian day number (ET) as double (day)
Julian day number (UT) as double (day)
Julian day number (LMT=UT+geolon/360) as double (day)
geographic longitude as double (deg)
Julian day number (LAT) as double (day)
swe_date_conversion returns a list with named entries: return status flag as integer,
jd Julian day number as double
swe_revjul returns a list with named entries: year year as integer,
month month as integer, day day as integer and hour hour as double.
swe_utc_time_zone returns a list with named entries: year_out year as integer,
month_out month as integer, day_out day as integer, hour_out hour as integer, min_out minute as integer,
sec_out second as double,
swe_utc_to_jd returns a list with named entries: return status flag as integer,
dret Julian day number as numeric vector and serr for error message as string.
swe_jdet_to_utc returns a list with named entries: year_out year as integer,
month_out month as integer, day_out day as integer, hour_out hour as integer, min_out minute as integer,
sec_out second as double,
swe_jdut1_to_utc returns a list with named entries: year_out year as integer,
month_out month as integer, day_out day as integer, hour_out hour as integer, min_out minute as integer,
sec_out second as double,
swe_swe_time_equ returns a list with named entries: return status flag as integer,
e equation of time (day) as double and serr for error message as string.
swe_lmt_to_lat returns a list with named entries: return status flag as integer,
jd_lat Julian day number (LAT) (day) as double and serr for error message as string.
swe_lat_to_lmt returns a list with named entries: return status flag as integer,
jd_lmt Julian day number (LMT) (day) as double and serr for error message as string.
Convert calendar dates to the astronomical time scale which measures time in Julian day number.
Convert calendar dates to the astronomical time scale which measures time in Julian day number and checks if the calendar date is legal.
Compute year, month, day and hour from a Julian day number.
Convert local time to UTC and UTC to local time.
Convert UTC to Julian day number (UT and ET).
Convert Julian day number (ET) into UTC.
Convert Julian day number (UT1) into UTC.
Calculate equation of time (LAT-LMT).
Convert Julian day number (LMT) into Julian day number (LAT).
Convert Julian day number (LAT) into Julian day number (LMT).
Section 7 in http://www.astro.com/swisseph/swephprg.htm. Remember that array indices start in R at 1, while in C they start at 0!
data(SE)
swe_julday(2000,1,1,12,SE$GREG_CAL)
#> [1] 2451545
swe_date_conversion(2000,1,1,12,"g")
#> $return
#> [1] 0
#>
#> $jd
#> [1] 2451545
#>
swe_revjul(2452500,SE$GREG_CAL)
#> $year
#> [1] 2002
#>
#> $month
#> [1] 8
#>
#> $day
#> [1] 13
#>
#> $hour
#> [1] 12
#>
swe_utc_time_zone(2000,1,1,12,5,1.2,2)
#> $year_out
#> [1] 2000
#>
#> $month_out
#> [1] 1
#>
#> $day_out
#> [1] 1
#>
#> $hour_out
#> [1] 10
#>
#> $min_out
#> [1] 5
#>
#> $sec_out
#> [1] 1.2
#>
swe_utc_to_jd(2000,1,1,0,12,3.4,SE$GREG_CAL)
#> $return
#> [1] 0
#>
#> $dret
#> [1] 2451545 2451545
#>
#> $serr
#> [1] ""
#>
swe_jdet_to_utc(2452500,SE$GREG_CAL)
#> $year_out
#> [1] 2002
#>
#> $month_out
#> [1] 8
#>
#> $day_out
#> [1] 13
#>
#> $hour_out
#> [1] 11
#>
#> $min_out
#> [1] 58
#>
#> $sec_out
#> [1] 55.816
#>
swe_jdut1_to_utc(2452500,SE$GREG_CAL)
#> $year_out
#> [1] 2002
#>
#> $month_out
#> [1] 8
#>
#> $day_out
#> [1] 13
#>
#> $hour_out
#> [1] 12
#>
#> $min_out
#> [1] 0
#>
#> $sec_out
#> [1] 0.2300933
#>
swe_time_equ(2452500)
#> $return
#> [1] 0
#>
#> $e
#> [1] -0.003387399
#>
#> $serr
#> [1] ""
#>
swe_lmt_to_lat(2452500,0)
#> $return
#> [1] 0
#>
#> $jd_lat
#> [1] 2452500
#>
#> $serr
#> [1] ""
#>
swe_lat_to_lmt(2452500,0)
#> $return
#> [1] 0
#>
#> $jd_lmt
#> [1] 2452500
#>
#> $serr
#> [1] ""
#>