Relating to or appearing near the sun, particularly referring to the rising or setting of a celestial body (such as a star or planet) as it becomes visible or invisible in the sky due to the sun's proximity and the Earth's rotation. A heliacal rising is the first appearance of a celestial object above the horizon just before sunrise after a period of invisibility, while a heliacal setting is its last appearance after sunset before a period of invisibility. The term often signifies importance in ancient astronomical observations and calendar systems where the heliacal rising of certain stars correlated to seasonal changes, agricultural practices and ceremonial dates.
Heliacal meaning with examples
- Ancient Egyptians carefully observed the heliacal rising of Sirius, as its reappearance just before dawn each year coincided with the annual flooding of the Nile. This sighting was crucial for predicting the fertile seasons and guiding agricultural practices, illustrating the practical significance of the heliacal events.
- Astrologers of old, carefully tracking the heliacal setting of planets and constellations would study the last view of a planet visible after the setting of the sun to assess its astrological influence, as this event was deemed particularly potent in affecting mundane and human affairs.
- Many ancient cultures developed calendars, based on the heliacal appearances of celestial objects. Understanding when particular stars became visible or invisible was vital for societal organization, time-keeping, and the planning of religious ceremonies.
- The precise timing of a heliacal rising can be affected by atmospheric conditions and the observer's location. Differences in altitude, air pollution, and the observer's latitude can affect the visibility and thus, the accuracy of recording these astronomical events.
Heliacal Synonyms
astral astronomical celestial diurnal solarHeliacal Antonyms
ahaelical non-astronomical non-solarHeliacal Crossword Answers
6 Letters
HELIAC