what is the angle of tilt for the earth's axis
Axial tilt At an obliquity of zero, the two axes point in the same direction; i.e., the rotational axis is perpendicular to the orbital plane. Earth's obliquity oscillates between 22.1 and 24.5 degrees[2] on a 41,000-year cycle; the earth's mean obliquity is currently 23°26′13.1″ (or 23.43699°) and decreasing.