The correct answer is A) 27 March. The Nautical Almanac provides the positions of celestial bodies, including the planets Jupiter and Saturn, throughout the year. Around the time of the spring equinox, which is typically on or around March 21, Jupiter and Saturn can be observed as both evening and morning stars in temperate latitudes. This is because the planets' positions in the sky allow them to be visible in both the evening and morning skies during this period. The other answer choices do not correspond to the optimal time of year for observing Jupiter and Saturn as both evening and morning stars in temperate latitudes.