Timekeeping on Venus is observed by various systems which are used across planet Venus. In comparison to timekeeping systems which have been used on Earth throughout history, Venusian timekeeping faced many physiological hurdles due to the planet's physical difference. In comparison to Earth, the more noted challenges on Venus include a longer day-night cycle (days/sols), a shorter orbital period around the Sun (year), and a lack of noticeable seasonal changes throughout its orbit.