Venus.
one day
In astronomy, a day is the time it takes for a planet to rotate once on its axis. A month is the time it takes for the moon to orbit around a planet. A year is the time it takes for a planet to orbit around its star.
Around its axis is a day. Around its orbit is a year.
The planet that takes approximately 28 days to complete an orbit around the Sun is not a planet but the Moon, which takes about 27.3 days to orbit Earth. If you're referring to a planet specifically, the time it takes for planets to orbit the Sun varies; for example, Mercury takes about 88 Earth days. However, no major planet in our solar system has a 28-day orbital period.
One round trip around the sun is called a "YEAR".
one day
A "year" is the time it takes for the earth to orbit the sun. Each planet has it's own year. A "day" is how long it takes for the planet to spin all the way around.
In astronomy, a day is the time it takes for a planet to rotate once on its axis. A month is the time it takes for the moon to orbit around a planet. A year is the time it takes for a planet to orbit around its star.
Around its axis is a day. Around its orbit is a year.
The planet that takes approximately 28 days to complete an orbit around the Sun is not a planet but the Moon, which takes about 27.3 days to orbit Earth. If you're referring to a planet specifically, the time it takes for planets to orbit the Sun varies; for example, Mercury takes about 88 Earth days. However, no major planet in our solar system has a 28-day orbital period.
One round trip around the sun is called a "YEAR".
Earth is the planet that takes approximately 365.25 days to orbit the sun. This extra 0.25 day is why we have a leap year every four years to account for the extra time.
On this planet, a day is longer than a year because the planet has a very slow rotation on its axis. This means it takes longer for the planet to complete one full rotation (a day) than it does to complete one orbit around its star (a year).
A year. Any planet, any length of time, for that planet once around the sun is their year.
If you mean a locked orbit like some "hot Jupiter" exoplanets, then the answer is; one side of the planet will haveendless daylight and the other side a never ending night. In other words its "solar day" would last "for ever". Comment: that's not what the question says. It's about having no rotation at all. In that (unlikely) case the "sidereal day" would be, technically, infinite. The "solar day" would equal the length of the planet's year.
Venus - it takes 243 days to spin on its axis relative to the background stars, while it takes 224.7 days to orbit the sun.
Roughly, the day. To be precise, the day also depends slightly on the planet's orbit around the Sun, but if the time it takes for a planet to rotate once is short, compared to the time of an orbit, it won't make much difference. For instance, a day on Earth is 24 hours; the time it takes Earth to rotate once is about 23 hours and 56 minutes.