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  • $\begingroup$ The planet is going to have tropical regions, at least if it has a somewhat Earthlike axial tilt, because the tropics are defined by the axial tilt as the furthest north & south latitudes at which the sun can be directly overhead. They just won't be hot, like (most of) Earth's tropics. $\endgroup$
    – jamesqf
    Commented Feb 24, 2018 at 22:36
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    $\begingroup$ @jamesqf I was referring to tropical climates, which are not the same as the region between the tropic lines (although that is where basically all tropical climates will occur on an Earth-like planet), but it's nice of you to point out that meaning. Tropical climates require that no month has an average temperature below 18C, by their definition. If it's not hot, it's not a tropical climate. $\endgroup$
    – Palarran
    Commented Feb 25, 2018 at 0:10
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    $\begingroup$ I realize what you meant, but since the OP is clearly asking about tropics in the axial tilt rather than "really warm" sense (by specifying the tilt and a low average temperature), you're answering a question that wasn't asked, and probably isn't relevant. $\endgroup$
    – jamesqf
    Commented Feb 25, 2018 at 2:20
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    $\begingroup$ @jamesqf A good point, actually. I'm too used to thinking of climates (having devised fictional climate maps before now) over simple regions and didn't recognize that the equatorial regions were actually the focus of the question. $\endgroup$
    – Palarran
    Commented Feb 25, 2018 at 4:43