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.
We are accustomed to thinking of a day as a period of 24 hours. However, that definition is a narrow one that only applies to our own planet. A day is the length of time it takes for a planet to complete one rotation on its axis â 360Â°.Since all of the planets rotate at different speeds, the length of a day on each one differs. planets of our Solar System. Compared to Earth, Mercury has a very long day. day on Venus is 243 Earth days. Venusâ day is actually longer than its year. It only takes 224.7 Earth days for the planet to orbit the Sun. We measure a day on Earth as a period of 24 hours, but it actually takes the planet 23 hours 56 minutes and 4 seconds to rotate on its axis.