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A comment on Earth and Sun. Parent comment
Earth's mean obliquity is currently 23°26′12.2″ (or 23.43672°) and decreasing.
https://en.wikipedia.org/wiki/Axial_tilt
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Earth's mean obliquity is currently 23°26′12.2″ (or 23.43672°) and decreasing.
https://en.wikipedia.org/wiki/Axial_tilt