twilight {birdscanR}

Get the nautical, civil, and solar dawn and dusk for a given timerange and locations.

Description

Get the time of nautical (sun at 12 degrees below horizon), civil (sun at 6 degrees below horizon) and solar (sun at 0 degrees below horizon) dawn and dusk for each day over a given time range.

Usage

twilight(timeRange, latLon, crs_datum = "WGS84", timeZone)

Arguments

timeRange

A two-element character vector with elements of the form %Y-%m-%d defining the start and end of the timerange for which you want to get the twilight information.

latLon

A list of X, Y coordinates

crs_datum

The coordinate reference system and datum of the X, Y coordinates. Default = "WGS84.

timeZone

The time zone of the area of interest

Value

A data frame with the results

Author(s)

Fabian Hertner, [e-mail]; Birgen Haest, [e-mail]

Examples

## Not run: 
sunrisesunset = twilight(timeRange = c("2021-01-15 00:00", 
                                       "2021-01-31 00:00"),
                         latLon    = c(47.494427, 8.716432),
                         timeZone  = "Etc/GMT0")

## End(Not run)