calendar_change | R Documentation |
The exact julian day computation is adapted from ode::julianDay() and tested againts test cases in Redas and Andreas (2008, table A4.1) for validity up to year 4712 BC.
calendar_change
julian_day(time)
julian_day_fast(time)
julian_century(time)
geom_mean_lon_sun(x)
geom_mean_anom_sun(x)
eccent_earth_orbit(x)
sun_eq_of_ctr(x, anom)
sun_rad_vector(eccent, anom)
sun_app_lon(x, lon)
mean_obliq_eclip(x)
obliq_corr(x, eclip)
sun_rt_ascen(app.lon, obliq.corr)
sun_decline(app.lon, obliq.corr)
var_y(obliq.corr)
eq_of_time(mean.lon, eccent.earth, anom.mean, var.y)
ha_sunrise(lat, decline, nag = 0)
solar_noon(lon, eq.of.time)
sunrise(noon, ha.sunrise)
sunset(noon, ha.sunrise)
sunlight_duration(ha.sunrise, unit.out = "hours")
solar_datetime(time, lat, lon, eq.of.time)
solar_tod(time, lat, lon, eq.of.time)
hour_angle(solar.time)
zenith_angle(lat, hour.angle, decline)
elevation_angle(lat, hour.angle, decline)
atm_refraction_approx(elevation.angle)
azimuth_angle(lat, hour.angle, zenith.angle, decline)
time |
dateTime |
x |
numeric Julian century |
anom |
numeric Solar anomaly in degrees |
eccent |
numeric Eccentricity of Earth orbit |
eclip |
numeric Ecliptic |
app.lon, obliq.corr, mean.lon, nag, decline |
numeric Angles in degrees |
lat, lon |
numeric Geographic coordinates in degrees |
eq.of.time, ha.sunrise, noon |
numeric |
zenith.angle, elevation.angle, hour.angle |
numeric Angles in degrees |
An object of class POSIXct
(inherits from POSIXt
) of length 1.
Low level functions based on NOAA's Excel worksheet
datetime
numeric
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