antizenith {skyscapeR}

Declination of the anti-zenith sun for a given location

Description

This function returns the declination of the sun when it is at the anti-zenith for a given location with corrected average parallax. If this phenomena does not occur at given location (i.e. if location is outside the tropical band) the function returns a NULL value.

Usage

antizenith(loc, parallax = 0.00224, altitude = 0)

Arguments

loc

This can be either the latitude of the location, or a skyscapeR.horizon object.

parallax

(Optional) Average parallax value for the sun. Defaults to 0.00224.

altitude

(Optional) Altitude of the sun. Defaults to 0 degrees.

See Also

jS, dS, eq, zenith, spatial.equinox, parallax.corr

Examples

# Anti-zenith sun declination for Mexico City:
antizenith(19.419)

# There is no anti-zenith sun phenomena in London:
antizenith(51.507)