To cite lunar in publications use:

Lazaridis, E. (2022). lunar: Lunar Phase & Distance, Seasons and Other Environmental Factors (version 0.2-01). Available from CRAN

Corresponding BibTeX entry:

  @Manual{,
    title = {lunar: Lunar Phase & Distance, Seasons and Other
      Environmental Factors},
    author = {Emmanuel Lazaridis},
    year = {2022},
    note = {(Version 0.2-01)},
  }