def calcularITH(ta, hr):
	"""
	Calculate ith from ta and hr
	return ith
	ith = 1.8 * ta + 32 - (0.55 - (0.55 * (hr/100.0))) * (1.8 * ta) - 26.0
	param: ta: temperatura ambiente
	param: hr: humedad relativa
	param: ith: indice termohigrometrico
	"""
	cal1 = 1.8 * ta
	cal2 = (0.55 - (0.55 * (hr/100.0)))
	cal3 = (1.8 * ta) - 26.0
	ith = cal1 + 32 - cal2 * cal3
	return ith