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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    $\begingroup$ Hello, and welcome to Stack Exchange. Are you asking about the angle between the Earth's axis and its equator? They're defined as 90° apart... $\endgroup$ Aug 7 '18 at 2:47
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    $\begingroup$ You might be thinking of the ecliptic, the plane of the Earth's orbit around the Sun, but, as @DanielGriscom notes, the equator-pole angle is 90 degrees by definition. $\endgroup$
    – user967
    Aug 8 '18 at 15:09
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    $\begingroup$ I'm aware of equator-pole angle, I wanted the angle between axis and equator. Thanks @DanielGriscom, your comment has answered the question. $\endgroup$
    – user1
    Aug 8 '18 at 17:57
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    $\begingroup$ Glad this helped you. It would be great if you clarified your question a bit; I'll then add my comment as an answer to help future visitors. $\endgroup$ Aug 8 '18 at 18:09
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    $\begingroup$ Is the question clear now, do you want me to change in any other way? $\endgroup$
    – user1
    Aug 9 '18 at 19:07

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