| AnnotateDaylight | Annotate ggplot with a band indicating solar events | 
| AnnotateLunarphase | Annotate ggplot with lunar phases | 
| annotate_daylight | Annotate ggplot with a band indicating solar events | 
| annotate_lunarphase | Annotate ggplot with lunar phases | 
| annotate_periodstates | Annotate a period in an hourglass plot | 
| bats | Observations from a bat detector | 
| CoordHourglass | Hourglass coordinates for a ggplot | 
| coord_hourglass | Hourglass coordinates for a ggplot | 
| GeomHourglass | Add an 'hourglass' layer to a ggplot | 
| geom_hourglass | Add an 'hourglass' layer to a ggplot | 
| get_date | Functions to split datetime into date and time of day | 
| get_hour | Functions to split datetime into date and time of day | 
| lunar_phase_polygon | Get the shape of the illuminated part of the moon | 
| StatHourglass | A ggplot2 'stat' function to wrangle data for 'geom_hourglass'. | 
| stat_hourglass | A ggplot2 'stat' function to wrangle data for 'geom_hourglass'. | 
| uses_dst | Test if datetime object potentially uses daylight saving time |