RchivalTag (version 0.2.2)

get_DayTimeLimits: Estimating the timing of sunrise, sunset, astronomical and nautical twilight events

Description

Estimating the timing of sunrise, sunset, astronomical and nautical twilight events in POSIXct-format based on geolocations and a similar time vector. The function is a simplified call of the sunriset and crepuscule functions of the suntools package, which use algorithms provided by NOAA.

Usage

get_DayTimeLimits(pos)

Value

The input data.frame

pos extended by the time vectors sunrise, sunset, dawn.naut, dawn.ast, dusk.naut, and dusk.ast.

Arguments

pos

A data.frame with columns datetime (POSIXct), Lon, and Lat.

Author

Robert K. Bauer

References

Meeus, J. (1991) Astronomical Algorithms. Willmann-Bell, Inc.

See Also

sunriset, crepuscule, classify_DayTime

Examples

#### Example 1: estimate current times of dawn, sunrise, dusk and sunset in Mainz, Germany
pos <- data.frame(Lat = 50, Lon = 8.2667)
pos$datetime <- strptime(Sys.Date(),"%Y-%m-%d")
get_DayTimeLimits(pos)

#### Example 1b: classify current time of the day in Mainz, Germany
classify_DayTime(get_DayTimeLimits(pos))