How long is a day on Venus? It's always changing, new study reveals

[Admin]

Astronomers have long struggled to pin down how long a day lasts on Venus, but new research suggests the difficulty stems not from flawed measurements but from real variations in the planet's spin.

How long is a day on Venus? It's always changing, new study reveals : Read more

 

[rod]

Another report on this radar observations of Venus, How long is a day on Venus? Scientists crack mysteries of our closest neighbor, https://phys.org/news/2021-04-day-venus-scientists-mysteries-closest.html

My observation. Radar measurements of Venus establish the Earth-Venus distance and Venus transits of the Sun establish the Earth-Sun distance, the astronomical unit. Very secure distance measurements in astronomy now because of radar observations and measurements. Venus spins retrograde. Venus length-of-day (LOD) is now shown to be 243.0226 Earth days. The tilt of Venus axis is 2.6392 degrees, and precession rate of Venus 29,000 years. Venus planet core may be 3500 km in diameter, reported like Earth’s core size. The space.com article reports "The analyses also estimate the size of Venus' core to be about 4,350 miles (7,000 kilometers) across, or 58% of the planet's diameter, although the scientists emphasize that calculation is quite uncertain."

Here is an important statement in the phys.org report on Venus cited in this record.

"Earth and Venus have a lot in common: Both rocky planets have nearly the same size, mass and density. And yet they evolved along wildly different paths. Fundamentals such as how many hours are in a Venusian day provide critical data for understanding the divergent histories of these neighboring worlds."

The carbon content of Earth vs. Venus is a real problem in the solar nebula, accretion disk model for the origin of the Earth and solar system. The solar nebula and accretion disk model features catastrophism in the solar system to explain origins today and differences between Earth and Venus. Earth is habitable and abundant with life; on Venus life is not confirmed, and Venus is vastly different than Earth. According to the solar nebula model, time, chance, and catastrophism is the creator and explains the differences between Earth and Venus in origins science teaching.