photobiologySunCalc: Sun and Atmosphere Calculations

Compute the position of the sun, day and night length, local solar time using Meeus' very accurate formulae. Estimate air mass (AM) from solar elevation, reference evapotranspiration, and interconvert air water content expressed as different physical quantities.

Details

Please see the vignette 0: The R for Photobiology Suite for a description of the suite.

References

Aphalo, Pedro J. (2015) The r4photobiology suite. UV4Plants Bulletin, 2015:1, 21-29. doi:10.19232/uv4pb.2015.1.14 .

See also

Useful links:

• https://docs.r4photobiology.info/xx/

• https://github.com/aphalo/xx

• Report bugs at https://github.com/aphalo/xx/issues

Author

Maintainer: Pedro J. Aphalo pedro.aphalo@helsinki.fi (ORCID)

Examples

# daylength
sunrise_time(lubridate::today(tzone = "EET"), tz = "EET",
             geocode = data.frame(lat = 60, lon = 25),
             unit.out = "hour")
#> [1] 5.240098
day_length(lubridate::today(tzone = "EET"), tz = "EET",
           geocode = data.frame(lat = 60, lon = 25),
           unit.out = "hour")
#> [1] 16.3817
sun_angles(lubridate::now(tzone = "EET"), tz = "EET",
           geocode = data.frame(lat = 60, lon = 25))
#> # A tibble: 1 × 12
#>   time                tz    solartime  longitude latitude address azimuth
#>   <dttm>              <chr> <solar_tm>     <dbl>    <dbl> <chr>     <dbl>
#> 1 2024-08-06 10:37:12 EET   09:11:19          25       60 NA         126.
#> # ℹ 5 more variables: elevation <dbl>, declination <dbl>, eq.of.time <dbl>,
#> #   hour.angle <dbl>, distance <dbl>

water_vp_sat(23) # 23 C -> vapour pressure in Pa
#> [1] 2809.097