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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.
Early attempts to establish timekeeping on Venus go back to the late 1970s when better understanding of Venus' day-night cycle became widely known. Most of the currently used systems were standardized and adopted in the 1990s when human colonization of the planet began. Much as on Earth, varying systems have been adopted by the nations and settlements of Venus.
The length of a Venusian year (the time it takes Venus to make one revolution around the Sun) is roughly 225 Earth days. The average period for Venus to rotate around its axis (a single day-night cycle) is about 34 Earth hours. Venus' polar axis is tilted at 177°, meaning that the planet is virtually upside down from the viewpoint of Earth (and the majority of the planets of the Solar System). In comparison to Earth's 23° tilt, Venus would be merely 2° (which means the seasonal changes are barely noticeable during the Venusian year).
Calendars in use
The Venusian calendar was adopted in the late 1990s by the Soviet Union and is based on the unique characteristics of Venus. While counting seconds, minutes, and hours the same as on Earth; the calendar counts 34 hours to a sol (day), between 19-20 sols in a neith (month), and eight neiths to a year (about 158 sols). The sols in a neith (the month equivalent) roughly correspond to the period it takes Venus' moon Neith to make one revolution around the planet. Eight neiths were also favored to showcase the shorter Venusian year in comparison to Earth, with them being named after their seasonal characteristics (based on the Russian language and centered in New Kamchatka). Venus is divided into 34 time zones, with New Kamchatkan Time (NKT) acting as the time standard for the entire planet (much like UTC/GMT on Earth). A 17-hour clock was adopted for Venusian Time, though most Venusians using the system prefer using 34-hours timekeeping (as opposed to the commonly used AM/PM system used by Americans). Venusian year zero has been synchronized to year zero of the Holocene calendar (which roughly starts at the beginning of the Holocene). The current year on Venus is 13273 using the Venusian Holocene calendar.
While popular in keeping sync the physical characteristics of Venus, the calendar has proven somewhat difficult for human settlers (especially in regards to a longer day).