Every rotation of a planet on its axis is a planetary day.
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spinning
It doesn't. Day and night are planetary phenomena caused by the rotation of the planet.
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Mars spins slower than earth
It corresponds with Sunday of the planetary week. Islamic days begin at sunset
It depends on which planet your talking about, for example if your talking about Earth its about 24 hours.
The adjective form of "planet" is "planetary." It describes anything related to or characteristic of planets, such as planetary systems, planetary atmospheres, or planetary science.
Someone who studies planetary systems is called a planetary scientist
Mars is a planetary body.
How about a compound planetary gearset?
planetary has a root word and it is planet