suncalc (version 0.5.0)

getMoonPosition: Get Moon position

Description

Get Moon position

Usage

getMoonPosition(date = NULL, lat = NULL, lon = NULL, data = NULL,
  keep = c("altitude", "azimuth", "distance", "parallacticAngle"))

Value

data.frame

Arguments

date

: Single or multiple DateTime. Can be a Date (YYYY-MM-DD), a character in UTC (YYYY-MM-DD HH:mm:ss) or a POSIXct

lat

: numeric. Single latitude

lon

: numeric. Single longitude

data

: data.frame. Alternative to use date, lat, lon for passing multiple coordinates

keep

: character. Vector of variables to keep. See Details

Details

Returns an object with the following properties:

• "altitude" : moon altitude above the horizon in radians

• "azimuth" : moon azimuth in radians

• "distance" : distance to moon in kilometers

• "parallacticAngle" : parallactic angle of the moon in radians

See Also

getSunlightTimes, getMoonTimes, getMoonIllumination, getMoonPosition,getSunlightPosition

Examples

# one date
getMoonPosition(date = Sys.Date(), lat = 50.1, lon = 1.83)

# in character
getMoonPosition(date = c("2017-05-12", "2017-05-12 00:00:00"), 
    lat = 50.1, lon = 1.83)

# in POSIXct
getMoonPosition(date = as.POSIXct("2017-05-12 00:00:00", tz = "UTC"),
    lat = 50.1, lon = 1.83)
getMoonPosition(date = as.POSIXct("2017-05-12 02:00:00", tz = "CET"),
    lat = 50.1, lon = 1.83)

# multiple date + subset
getMoonPosition(date = seq.Date(Sys.Date()-9, Sys.Date(), by = 1), 
  keep = c("altitude", "azimuth"), 
  lat = 50.1, lon = 1.83)
  
# multiple coordinates
data <- data.frame(date = seq.Date(Sys.Date()-9, Sys.Date(), by = 1), 
    lat = c(rep(50.1, 10), rep(49, 10)), 
    lon = c(rep(1.83, 10), rep(2, 10)))
    
getMoonPosition(data = data, 
  keep = c("altitude", "azimuth"))