19/11/2025
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Mercury's highly eccentric, egg-shaped orbit takes the planet as close as 29 million miles (47 million kilometers) and as far as 43 million miles (70 million kilometers) from the Sun. It speeds around the Sun every 88 days, traveling through space at nearly 29 miles (47 kilometers) per second, faster than any other planet.
Mercury spins slowly on its axis and completes
one rotation every 59 Earth days. But when
Mercury is moving fastest in its elliptical orbit
around the Sun (and it is closest to the Sun),
each rotation is not accompanied by sunrise and
sunset like it is on most other planets. The
morning Sun appears to rise briefly, set, and rise
again from some parts of the planet's surfaceThe same thing happens in reverse at sunset for other parts of the surface. One Mercury solar day (one full day-night cycle) equals 176 Earth days just over two years on Mercury.
Mercury's axis of rotation is tilted just 2 degrees with respect to the plane of its orbit around the Sun. That means it spins nearly perfectly upright and so does not experience seasons as many other planets do.
