Section 2: Computing positions

Computing positions of planets, asteroids, lunar nodes and apogees using Swiss Ephemeris.

swe_calc_ut(jd_ut, ipl, iflag)

swe_calc(jd_et, ipl, iflag)

Arguments

jd_ut

UT Julian day number as double (day)

ipl

Body/planet as integer (SE$SUN=0, SE$Moon=1, ... SE$PLUTO=9)

iflag

Computation flag as integer, many options possible (section 2.3.1)

jd_et

ET Julian day number as double (day)

Value

swe_calc_ut returns a list with named entries: return status flag as integer,

xx information on planet position, and serr error message as string.

swe_calc returns a list with named entries: return status flag as integer,

xx updated star name as string and serr error message as string.

Details

swe_calc_ut()

It compute positions using UT.

swe_calc()

It compute positions using ET.

See also

Section 2 in http://www.astro.com/swisseph/swephprg.htm. Remember that array indices start in R at 1, while in C they start at 0!

Examples

data(SE)
swe_calc_ut(2458346.82639, SE$MOON, SE$FLG_MOSEPH)
#> $return
#> [1] 4
#> 
#> $xx
#> [1] 2.094039e+02 5.238765e+00 2.547673e-03 0.000000e+00 0.000000e+00
#> [6] 0.000000e+00
#> 
#> $serr
#> [1] ""
#> 
swe_calc(2458346.82639, SE$MOON, SE$FLG_MOSEPH)
#> $return
#> [1] 4
#> 
#> $xx
#> [1] 209.39320561   5.23865656   0.00254764   0.00000000   0.00000000
#> [6]   0.00000000
#> 
#> $serr
#> [1] ""
#>