Dot product and Raycast.

[LiterallyJeff]

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Dot product returns a number between -1 and 1.

For normalized vectors Dot returns 1 if they point in exactly the same direction; -1 if they point in completely opposite directions; and a number in between for other cases (e.g. Dot returns zero if vectors are perpendicular).

Unity - Scripting API: Vector2.Dot

Your ship needs to be upright to land. You’re comparing the ground normal pointing up, with the ship’s Y axis pointing down (your comment says world Y axis, but it’s local to the ship’s transform). In a perfect landing, they will be opposite and return a -1. So if you require your ship to be within 45 degrees of that, you can check if the dot product is less than -0.5f.