precession_star: Equatorial coordinates for a stat due to precession

In Susarro/arqastwb: Archaeoastronomy algorithms

Description

Equatorial coordinates for a stat due to precession

Usage

precession_star(jd, former_jd = str2jd("2000-01-01T12:00"),
  former_declination, former_right_ascension, proper_motion_declination,
  proper_motion_right_ascension)

Arguments

jd	Julian day
former_jd	Julian day for reference (usually J2000)
former_declination	Reference declination in degrees
former_right_ascension	Reference right ascension in hour angle
proper_motion_declination	Proper motion declination in degrees
proper_motion_right_ascension	Proper motion right ascension in hour angle

Value

Equatorial coordinates

• declination Declination in degrees

• right_ascension Right ascension in hour angle

Examples

fra<-str2hours("02:44:11.986")
fd<-str2degrees("49<c3><82><c2><ba>13'42.48\u0022")
former_jd=str2jd("2000-1-1T12:00")
jd<-julian_day(13.19,11,2028)
pmra<-0.03425/3600
pmd<--0.0895/3600
precession_star(jd, str2jd("2000-01-01T12:00"),fd,fra, pmd, pmra)

Susarro/arqastwb documentation built on May 21, 2019, 10:28 a.m.