attain. English Collins Dictionary-English synonyms & Thesaurus &nbsp. attain (attains 3rd person present) (attaining present participle) (attained past tense & past participle) 1 verb If you attain something, you gain it or achieve it, often after a lot of effort. FORMAL Jim is halfway to attaining his pilot's licence.
The length of day on Mercury is 58.646 Earth days. This is a sidereal day, which is the amount of time it takes Mercury to turn once on its axis compared to the background stars. If you could look down from above Mercuryâs north pole, it would take almost 59 days to turn in a counter-clockwise direction. Mosaic of Mercury. Credit: NASA / JHUAPL / CIW / mosaic by Jason Perry. Things get unusual because a year on Mercury only lasts 88 days. And a solar day on Mercury lasts 176 Earth days. In other words, if you could stand on the surface of Mercury, it would take 176 days for the Sun to return to the same spot in the sky. Astronomers used to suspect that Mercury was tidally locked to the Sun, and always showed the same face to the Sun; similar to how the Moon is tidally locked to the Earth.
planets of our Solar System. A year on Earth is 365 days â unless it is a leap year â but the actual definition of a year is the time it takes a planet to orbit the Sun. Mercury orbits the Sun in 88 Earth days, which is the shortest orbit of any of the planets.arthâs year is actually 365.25 days long, not the 365 days that we round it to. Because an Earth year is not exactly 365 days, we have a leap year â a year with 366 days â every four years. That extra day is added to the month of February so in a leap year it has 29 days instead of 28.