25/25 It will be remarked that many constellations well seen in the third half-hour (Chapter IV.) are favourably seen in the first also, and _vice versa_. For instance, the constellation Ursa Major well-placed towards the north-east in the first quarter of the year, is equally well-placed towards the north-west in the third, and similarly of the constellation Cassiopeia. The same relation connects the second and fourth quarters of the year. |