Glosario - V

Variable star is a star that seen to vary in brightness. This variation may be periodic, with one or more cycles that last hours, days, months, or even years. Some stars vary in an irregular manner, while others undergo cataclysmic changes in brightness.

Vernal equinox is the point in the year when the Sun appears to cross the celestial equator, while generally trending northward at each zenith passage. It represents the moment when the North Pole of the Earth begins to tilt toward the Sun.