julian_day: Solar astronomy using Meeus' algorithm
In SunCalcMeeus: Sun Position and Daylight Calculations

calendar_change

R Documentation

Solar astronomy using Meeus' algorithm

Description

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.

Usage

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)

Arguments

`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