Sun Position and Daylight Calculations R package SunCalcMeeus version 0.1.3 Compute the position of the sun, and local solar time using Meeus' formulae. Compute day and/or night length using different twilight definitions or arbitrary sun elevation angles. This package is part of the 'r4photobiology' suite, Aphalo, P. J. (2015) <doi:10.19232/uv4pb.2015.1.14>. Algorithms from Meeus (1998, ISBN:0943396611). Software Depends: R (>= 4.1.0) Imports: stats, tibble (>= 3.3.0), lubridate (>= 1.9.4), dplyr (>= 1.1.4) Suggests: knitr (>= 1.50), rmarkdown (>= 2.29), testthat (>= 3.2.3), roxygen2 (>= 7.3.0), lutz (>= 0.3.2), covr, spelling Pedro J. Aphalo <pedro.aphalo@helsinki.fi> Comprehensive R Archive Network (CRAN) Pedro J. Aphalo [aut, cre] (ORCID: <https://orcid.org/0000-0003-3385-972X>) GPL (>= 2) 2025-09-22 application/tgz https://CRAN.R-project.org/package=SunCalcMeeus doi:10.32614/CRAN.package.SunCalcMeeus en-US