There isn't such a planet called planet trio, not in our solar system at least. A planet trio refers to three planets seen in the same area of the sky, tightly bunched as viewed from earth. For example, you may see Mercury, Venus and Jupiter all close together in the sky and could call it a planet trio.
A day is 24 hours long and a year is 365 days
Mercury's "sidereal day" is about 59 Earth days long and its year is about 88 Earth days long. Venus has a "solar day" of about 117 Earth days and a year of about 225 Earth days.
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.
The period can refer to one of two things: the planets rotation about its axis (how long its day is) and the rotation around its star (how long its year is).
Mars. A "day" on Mars - which astronomers working with the Lunar Rovers call a "sol" - is about 24 hours 39 minutes 35 seconds. That's a "solar day". The "sidereal day" is a couple of minutes shorter.
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Which planet?
Rigel is a star, not a planet, so it does not have a day.
A day is 24 hours long and a year is 365 days
A day on Saturn is about 11 hours on Earth.
Long John Baldry Trio-Live was created on 1999-09-21.
one day
24 hour
murcury
Mercury is the planet with an 88-day year.
59 day noy are uahppy
How long it spins on it's axis