altaz2hadec {astrolibR}R Documentation

Convert horizon (Alt-Az) coordinates to hour angle and declination

Description

Convert horizon (Alt-Az) coordinates to hour angle and declination

Usage

altaz2hadec(alt,az,lat)

Arguments

alt

local apparent altitude, in degrees, scalar or vector

az

local apparent altitude, in degrees, scalar or vector, measured east of north

lat

local geodetic latitude, in degrees, scalar or vector

Details

For inputs, if you have measured azimuth west-of-south (like the book MEEUS does), convert it to east of north via: az = (az + 180) mod 360 For outputs, the hour angle is the time that right ascension of 0 hours crosses the local meridian.

Value

ha

local apparent hour angle, in degrees

dec

local apparent declination, in degrees

Author(s)

Written by Chris O'Dell Univ. of Wisconsin-Madison May 2002

R adaptation by Arnab Chakraborty June 2013

See Also

hadec2altaz

Examples

altaz2hadec(59.0861,133.3081,41.3)  

[Package astrolibR version 0.1 Index]