obliquity
There are naturally occurring variations that affect climate and the cycles are different:The Eccentricity Cycle (Elliptical Cycle) - This occurs about every 100,000 years and is the longer cycle. It causes the earth to cool.The Obliquity Cycle (Axial Tilt) - 41,000 years. Increased obliquity can cause summers to be warmer and winters to be colder.The Precession Cycle (Wobble) - This cycle occurs every 26,000 years and can cause seasonal changes.
Obliquity - book - was created on 2010-03-25.
Uranus with an obliquity of 98oThe dwarf planet Pluto has an obliquity of 120oSee related link for a pictorial.
The obliquity.
Uranus has an obliquity (axial tilt) of 97.77 degrees.
~41,000 years, caused by changes in tilt of the earth relative to the plane of the orbit.
The Earth's tilt, or inclination, or obliquity is about 23.44 degrees from the plane of its orbit around the Sun.
If by parallel you mean that the axis points in the same direction throughout the year, the answer is yes.
Oblique has 2 meanings :- 1- Having a slanting or sloping direction, course, or position. 2- Devious, misleading, or dishonest
Obliquityis away of describing aplanet's axial "tilt". The answer is Uranus or Venus, depending on the way the planet's north pole is defined.
It rotates in the "retrograde" direction. "Obliquity" is another way of talking about the tilt of a planet's axis. You might say the planet is "upside down". The direction of the rotation is called "retrograde" ("backwards" compared with the Earth's rotation). Note: there is a complication here about how astronomers define the North pole of a planet, but that's probably an unnecessary complication for most people.