Bring the star again to the eastern and western parts of the horizon—observe the two points of the ecliptic then on the western edge of the horizon—and the two corresponding days, will be the days of the star's acronical rising and setting.
Source: wiktionary
The moon in arctic regions is not acronical, as astronomers say; it does not rise at sunset or set at sunrise.
Source: wiktionary
Due to the revolution of the earth, heliacal and acronical phenomena are separated by six months of time for a given star.
Source: wiktionary
The heliacal rising of this star group, that is its rising with the sun, heralded the summer season, while its acronical rising, when it rose as the sun set, marked the beginning of winter, and led to the association of the group with the rainy season, and with floods, so often mentioned by the poets.
Source: wiktionary
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