local p = {}

function p.Atan2(frame)
    y=frame.args['y']
    x=frame.args['x']
    return math.atan2( y, x )
end

function p.Atan2Deg(frame)
    y=frame.args['y']
    x=frame.args['x']
    deg=math.atan2( y, x ) *57.295779
    if deg < 0 then
            deg=360+deg
        end
    return deg
end

function p.GalL(frame)
    dec=frame.args['dec']
    ra=frame.args['ra']
    b=frame.args['b']
    
    x=math.cos(dec*0.017453) *math.sin((ra-192.85948)*0.017453) *0.889988
    y=math.sin(dec*0.017453) - math.sin(b)*0.455984
    
    l=math.atan2( y, x ) *57.295779
    if l < 0 then
    	l=360+l
    end
    l=l+32.93192
    return l
end

return p