1.Two radio astronomy observatories wish to set up a radio link. Their longitudes and latitudes are respectively +2◦ 18• 4, +53◦ 14• 2 (Jodrell Bank, England) and +79◦ 50• 2, +38◦ 26• 3 (Green Bank, West Virginia, USA). In what angular direction to the north must the antenna at the first station be set to achieve the best transmission (i.e. the great circle direction)?