get_DayTimeLimits: Estimating the timing of sunrise, sunset, astronomical and...

In RchivalTag: Analyzing and Interactive Visualization of Archival Tagging Data

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)

Arguments

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

Value

The input data.frame pos extended by the time vectors sunrise, sunset, dawn.naut, dawn.ast, dusk.naut, and dusk.ast.

Author(s)

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))

RchivalTag documentation built on Nov. 6, 2025, 1:18 a.m.