adjective
- relating to or occurring at the time when a star or constellation rises in the east at sunset or sets in the west at sunrise
Usage: astronomy; technical
Examples
- The acronical rising of Sirius marked an important date in the ancient Egyptian calendar.
- Astronomers observed the acronical setting of the constellation Orion in late spring.
- The acronical position of a star occurs when it is directly opposite the sun in the sky.
- Ancient civilizations tracked acronical events to predict seasonal changes.