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What is the angle between earth's axis of rotation and equator? Are they perpendicular or at 66 1/2 Degrees?

By rotational axis I mean axial tilt or Axial obliquity or 66 1/2 degrees tilt of earth to its orbital.
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Can anyone explain the torque that causes the Earth's axial precession?

Looking around on the web, I frequently see explanations like "precession is caused by the action of the Sun's gravity on the Earth's equatorial bulge." That's nice, but I'm interested in a little ...
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How much is Solar Radiation effected by Axial Tilt or Obliquity?

I know that the Axial Tilt of Earth is about 23.4° - 23.5°. And I would like to know how much this change effects Solar Radiation for particular geo-location. What is the Axial Tile change rate? How ...
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2answers
510 views

What would be the impact on tides if the earth had no tilt?

I would like to know what would be the impacts/effects on the tides if earth were to have no tilt (perpendicular to plane of ecliptic)?
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Axial Obliquity and Climate Change

The Wikipedia page for Earth's Axial tilt says: Earth's obliquity oscillates between 22.1 and 24.5 degrees on a 41,000-year cycle. It is currently 23.44 degrees and decreasing. My Questions are: ...
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1answer
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Climate on an Earth without an Axial Tilt

The Premise The Earth rotates on its own axis, which is tilted by about 23 degrees. I am imagining a situation where such an axial tilt does not exist. From general reading, it appears the largest ...
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0answers
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What would the equilibrium temperature be at the poles in a world without seasonality?

Inspired by: How does Antarctica stay frozen? If the Earth was in a fixed solstice state - northern winter and southern summer (e.g. the axis obliquity rotated with the Earth's orbit), what would ...
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Could Earth have had a greater axial tilt?

In thinking about the question, Why is earth's axis tilted?, and reading articles about Earth's axial tilt, I came across the website Snowball Earth which describes an alternate theory for global ...