How to use the pysolar.solar.GetAltitudeFast function in pysolar

p3 = FreeCAD.Vector(math.cos(a)*scale*1.08,math.sin(a)*scale*1.08,0)
        circles.append(Part.LineSegment(p1,p2).toShape())
        circlepos.append((ad,p3))

    # build the sun curves at solstices and equinoxe
    year = datetime.datetime.now().year
    hpts = [ [] for i in range(24) ]
    m = [(6,21),(7,21),(8,21),(9,21),(10,21),(11,21),(12,21)]
    if complete:
        m.extend([(1,21),(2,21),(3,21),(4,21),(5,21)])
    for i,d in enumerate(m):
        pts = []
        for h in range(24):
            if oldversion:
                dt = datetime.datetime(year, d[0], d[1], h)
                alt = math.radians(pysolar.solar.GetAltitudeFast(latitude, longitude, dt))
                az = pysolar.solar.GetAzimuth(latitude, longitude, dt)
                az = -90 + az # pysolar's zero is south, ours is X direction
            else:
                dt = datetime.datetime(year, d[0], d[1], h, tzinfo=tz)
                alt = math.radians(pysolar.solar.get_altitude_fast(latitude, longitude, dt))
                az = pysolar.solar.get_azimuth(latitude, longitude, dt)
                az = 90 + az # pysolar's zero is north, ours is X direction
            if az < 0:
                az = 360 + az
            az = math.radians(az)
            zc = math.sin(alt)*scale
            ic = math.cos(alt)*scale
            xc = math.cos(az)*ic
            yc = math.sin(az)*ic
            p = FreeCAD.Vector(xc,yc,zc)
            pts.append(p)

oldversion = True

    if tz:
        tz = datetime.timezone(datetime.timedelta(hours=-3))
    else:
        tz = datetime.timezone.utc

    year = datetime.datetime.now().year
    hpts = [ [] for i in range(24) ]
    m = [(6,21),(9,21),(12,21)]
    pts = []
    for i,d in enumerate(m):
        for h in [9,12,15]:
            if oldversion:
                dt = datetime.datetime(year, d[0], d[1], h)
                alt = math.radians(pysolar.solar.GetAltitudeFast(latitude, longitude, dt))
                az = pysolar.solar.GetAzimuth(latitude, longitude, dt)
                az = -90 + az # pysolar's zero is south, ours is X direction
            else:
                dt = datetime.datetime(year, d[0], d[1], h, tzinfo=tz)
                alt = math.radians(pysolar.solar.get_altitude_fast(latitude, longitude, dt))
                az = pysolar.solar.get_azimuth(latitude, longitude, dt)
                az = 90 + az # pysolar's zero is north, ours is X direction
            if az < 0:
                az = 360 + az
            az = math.radians(az)
            zc = math.sin(alt)
            ic = math.cos(alt)
            xc = math.cos(az)*ic
            yc = math.sin(az)*ic
            p = FreeCAD.Vector(xc,yc,zc).negative()
            p.normalize()