moon: Equatorial Coordinates of Moon

In moonsun: Basic astronomical calculations with R

Description

The function computes equatorial coordinates of Moon.

Usage

moon(jday = jd() + gmt()/24)

Arguments

jday	Julian Day Number.

Value

An object of class eqc, apos, data.frame containing computed coordinates. See planet() for details.

Note

The daily motion of the Moon is significant, and therefore default behavior of the function is to add a day fraction to the Julian Day Number, depending on current hour.

The algorithm used here is fairly simple and the expected accuracy is within 12 arc minutes of expected coordinates.

Author(s)

Lukasz Komsta

Examples

moon()
moon(jd(length=30))
as.ecc(moon())

Example output

                         ra             d phase angle dist size mag    
2018-11-08-Moon 15h 33m 20s -20* 54' 20''   0.7 -76.7 1.01 30.8  NA Lib
Warning messages:
1: In lst() :
  Your longitude is not set in the environment, assuming it is equal to 0
2: In lst() :
  Your longitude is not set in the environment, assuming it is equal to 0
                         ra             d phase  angle dist size mag    
2018-11-08-Moon 15h  9m 13s -18* 24' 41''   0.1  -75.5 1.00 31.1  NA Lib
2018-11-09-Moon 16h  3m 32s -21* 19' 48''   2.0  -79.1 1.02 30.5  NA Sco
2018-11-10-Moon 16h 58m 14s -23* 22' 51''   5.9  -84.0 1.03 30.2  NA Oph
2018-11-11-Moon 17h 52m 35s -24* 37'  1''  11.5  -89.3 1.04 29.9  NA Sgr
2018-11-12-Moon 18h 45m 50s -23*  0' 25''  18.5  -94.6 1.05 29.6  NA Sgr
2018-11-13-Moon 19h 37m 22s -22* 27' 19''  26.5  -99.4 1.05 29.6  NA Sgr
2018-11-14-Moon 20h 26m 54s -20* 49' 45''  35.2 -103.8 1.05 29.6  NA Cap
2018-11-15-Moon 21h 14m 31s -17* 58' 57''  44.4 -107.4 1.05 29.6  NA Cap
2018-11-16-Moon 22h  0m 34s -13* 46' 24''  53.9 -110.2 1.05 29.6  NA Aqr
2018-11-17-Moon 22h 45m 38s  -8*  4'  1''  63.2 -112.2 1.05 29.6  NA Aqr
2018-11-18-Moon 23h 30m 27s  -4* 43' 58''  72.2 -113.3 1.04 29.9  NA Psc
2018-11-19-Moon  0h 15m 52s   1* 37' 49''  80.6 -113.4 1.03 30.2  NA Psc
2018-11-20-Moon  1h  2m 45s   6* 35' 34''  88.0 -112.6 1.02 30.5  NA Psc
2018-11-21-Moon  1h 51m 60s  11* 24' 37''  93.9 -110.7 1.01 30.8  NA Ari
2018-11-22-Moon  2h 44m 21s  15* 48' 54''  98.0 -107.7 1.00 31.1  NA Ari
2018-11-23-Moon  3h 40m 17s  19* 29' 17''  99.9 -104.5 0.98 31.7  NA Tau
2018-11-24-Moon  4h 39m 37s  22*  5' 19''  99.3   82.5 0.97 32.0  NA Tau
2018-11-25-Moon  5h 41m 26s  23* 19' 23''  96.0   88.3 0.96 32.4  NA Tau
2018-11-26-Moon  6h 44m  6s  23*  1' 29''  90.3   94.4 0.95 32.7  NA Gem
2018-11-27-Moon  7h 45m 51s  21* 12' 26''  82.3  100.2 0.95 32.7  NA Gem
2018-11-28-Moon  8h 45m 17s  18*  3' 11''  72.5  105.2 0.95 32.7  NA Cnc
2018-11-29-Moon  9h 41m 51s  13* 50' 56''  61.7  109.1 0.95 32.7  NA Leo
2018-11-30-Moon 10h 35m 46s   8* 54' 55''  50.4  111.8 0.95 32.7  NA Leo
2018-12-01-Moon 11h 27m 41s   3* 33' 54''  39.2  113.2 0.95 32.7  NA Leo
2018-12-02-Moon 12h 18m 28s  -2*  5' 23''  28.6  113.4 0.96 32.4  NA Vir
2018-12-03-Moon 13h  9m  2s  -8* 45' 53''  19.3  112.4 0.97 32.0  NA Vir
2018-12-04-Moon 14h  0m  6s -13* 51' 12''  11.5  110.3 0.99 31.4  NA Vir
2018-12-05-Moon 14h 52m 10s -17* 36' 12''   5.6  107.1 1.00 31.1  NA Lib
2018-12-06-Moon 15h 45m 23s -20* 14'  2''   1.8  103.0 1.01 30.8  NA Lib
2018-12-07-Moon 16h 39m 29s -23* 54' 53''   0.1   99.0 1.02 30.5  NA Oph
Warning messages:
1: In lst() :
  Your longitude is not set in the environment, assuming it is equal to 0
2: In lst() :
  Your longitude is not set in the environment, assuming it is equal to 0
                          lat         long
2018-11-08-Moon 235* 38' 48''  0*  4' 53''
Warning messages:
1: In lst() :
  Your longitude is not set in the environment, assuming it is equal to 0
2: In lst() :
  Your longitude is not set in the environment, assuming it is equal to 0

moonsun documentation built on May 29, 2017, 12:17 p.m.