The term 'Astronomical Bear' is composed of four crossword solutions: URSA (4 letters), NOVAE (5 letters), MOONSET (7 letters), and NOVA (4 letters). URSA is the Latin word for bear, and a NOVA is a star that suddenly increases in brightness. A novae is a plural form of NOVA, and moonset is the time when the moon disappears below the horizon. Therefore, the term Astronomical Bear can be interpreted as a metaphor for a star that suddenly appears in the night sky, like a bear in the darkness.