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What type of planetary motion determines the length of the day?
spinning
When is the planetary day?
Every rotation of a planet on its axis is a planetary day.
What determines the length of day on a planet?
How long it spins on it's axis
How long is one planetary day?
It depends on which planet your talking about, for example if your talking about Earth its about 24 hours.
What determines the speed of orbit on Neptune?
According to Kepler's laws of planetary motion, its distance from the sun.
What determines the first day of spring?
The Vernal Equinox determines the first day of spring. The Autumn Equinox is what determines the first day of fall.
What are the different planetary day lengths?
bang bang
What is a planetary day?
One full revolution of that planet. The planetary day of Earth is 24 Earth hours long. Other planets spin at various speeds, with Jupiter the fastest (shortest day) and Venus the longest (barely rotating, and in the opposite direction of its orbit). Because of the short year on Mercury (88 Earth days), and its long day (59 Earth days), the apparent "solar day" on its surface is twice its year, or 176 Earth Days.
How does space have day and night?
It doesn't. Day and night are planetary phenomena caused by the rotation of the planet.
How long is the planetary year on Mars?
Approx 687 days.
What determines how many hours are in the day?
There are 24 hours in a day.
What determines a planets orbital period?
This depends on the mass of the planet (and sun or star that it orbits around) and the distance between the two. See Kepler's laws of planetary motion.
