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[9] [10] On the other hand, the time-averaged distance (rather than the inverse of the average inverse distance) between the centers of Earth and the Moon is 385,000.6 km (239,228.3 mi). One can also model the orbit as an ellipse that is constantly changing, and in this case one can find a formula for the semi-major axis, again involving ...
The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have synchronized the Moon's orbital period (lunar month) with its rotation period at 29.5 Earth days, causing the same side of the Moon to always face Earth.
With a mean orbital velocity around the barycentre between the Earth and the Moon, of 1.022 km/s (0.635 miles/s, 2,286 miles/h), [6] the Moon covers a distance approximately its diameter, or about half a degree on the celestial sphere, each hour.
Earth is getting a second moon, ... On January 8, 2025, according to NASA, it will skim past Earth at a distance of about 1.1 million miles (1.8 million kilometers).
[20] [21] The distance continually changes for a number of reasons, but averages 385,000.6 km (239,228.3 mi) between the center of the Earth and the center of the Moon. [22] The orbits of the Moon and planets are integrated numerically along with the orientation of the Moon called physical libration. [23]
The so-called mini moon will be overwhelmed by stronger ... It will pass as close as 1.1 million miles of Earth in January, maintaining a safe distance before it zooms farther into the solar ...
It calculates the Earth's diameter to be 8,000 miles (modern: 7,928 miles), [6] the diameter of the Moon as 2,400 miles (actual ~2,160) [6] and the distance between the Moon and the Earth to be 258,000 miles [6] (now known to vary: 221,500–252,700 miles (356,500–406,700 kilometres). [12]
In order to be considered a "mini-moon," an incoming object must reach Earth at a range around 2.8 million miles and at a steady space of about 2,200 mph, according to Marcos.