jS | R Documentation |
This function calculates the declination of the sun at June Solstice for a given year, based upon obliquity estimation and corrected average parallax.
jS(
year = skyscapeR.env$cur.year,
loc = FALSE,
parallax = 0.00224,
altitude = 0,
verbose = TRUE
)
year |
Year for which to calculate the declination. Defaults to present year as given by Sys.Date. |
loc |
(Optional) This can be either the latitude of the location, or a skyscapeR.horizon object. If missing or FALSE, function will output geocentric declination. |
parallax |
(Optional) Average parallax value for the sun. Defaults to 0.00224. |
altitude |
(Optional) Altitude of the sun. Defaults to 0 degrees. |
verbose |
(Optional) Boolean to control output of warnings and messages. Defaults to TRUE. |
obliquity
, dS
, eq
,
zenith
, antizenith
, spatial.equinox
,
parallax.corr
# June Solstice geocentric declination for year 4001 BC:
jS(-4000)
# Topocentric declination for same year and latitude of 50 degres N:
jS(-4000, loc=50)
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