Definition: The word 'sscln' originally meant "the sun." It refers to a solar eclipse in which the Sun appears as if it were obscured by clouds or shadows, resembling a slanted line across the sky. The term was first used in ancient Egypt and Mesopotamia for eclipses seen from the horizon when the Moon is at its highest point (also known as 'set') and the Sun is close to the horizon. It's often associated with the eclipse of 1604, when it happened during an eclipse visible from Cairo, Egypt, marking the end of the summer solstice in the Northern Hemisphere.