Examlex
"Borealis" is derived from the name of the Greek god of the north wind, Boreas, and literally means "of the North."
Great Serpent Mound
A prehistoric effigy mound in Ohio, USA, which depicts a giant serpent, often interpreted as an astronomical or religious symbol.
Halley's Comet
A short-period comet visible from Earth every 75-76 years, known for its spectacular sightings throughout human history.
Corbeled-vaulted Construction
A building technique where stones are laid overlapping each other slightly inward until they meet at the top, creating a self-supporting arch or dome.
Maya
A Mesoamerican civilization known for its advanced writing, architecture, mathematics, and astronomical system.
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