What is the current approximate measurement of the Earth's axial tilt relative to the ecliptic plane?
Answer
23.5 extdegree
The angle between the Earth's axis of rotation and the perpendicular to the ecliptic plane is currently measured to be approximately $23.5 extdegree$, a measurement known as the obliquity of the ecliptic.

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The Ecliptic: Crash Course Kids #37.2 - YouTube
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