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Eight years
- After eight years, it returns to the same place in our sky on about the same date. This is known as the eight-year cycle of Venus, and stems from the fact that 13 Venusian orbits (13 x 224.8 days) very nearly equals eight Earth years.
earthsky.org/astronomy-essentials/five-petals-of-venus/
Jan 22, 2023 · After eight years, it returns to the same place in our sky on about the same date. This is known as the eight-year cycle of Venus, and stems from the fact that 13 Venusian orbits (13 x 224.8...
The full cycle from new to full to new again takes 584 days (the time it takes Venus to overtake the Earth in its orbit). Venus (like the Moon) has 4 primary phases of 146 days each. The planet also changes in apparent size from 9.9 arc seconds at full (superior conjunction) up to a maximum of 68 arc seconds at new (inferior conjunction). [1]
The complete cycle, however, new to full, takes 584 days, while our Moon takes just a month. And it was this perspective, the phases of Venus first observed by Galileo through his telescope, that provided the key scientific proof for the Copernican heliocentric nature of the solar system.
Venus Phase Cycle, 1900-2050. Venus takes only 225 days to orbit the Sun. However, when she is viewed from Earth, her full synodic cycle (from inferior conjunction to inferior conjunction with the Sun) takes 584 days, or about 1.6 years.
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Jan 8, 2017 · Venus over the next two years. Venus is both closer to Sun and moves faster in its orbit than the Earth and, on average, it takes 584 days for Venus to be in the same place in its orbit as seen from the Earth. The reason for this 584 day cycle is given in the notes at the bottom of this post.
Nov 9, 2021 · Direct: all back to normal. Venus has gained enough momentum to go back to its usual speed. Or at least enough speed to make things go back to normal.
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Jun 18, 2014 · The precise amount of time in Earth days it takes for each planet to complete its orbit can be seen below. Mercury: 87.97 days (0.2 years) Venus : 224.70 days (0.6 years) Earth: 365.26 days (1 year) Mars: 686.98 days (1.9 years) Jupiter: 4,332.82 days (11.9 years)
