relation between semi major axis and semi minor axis of ellipse
Semi-major and semi-minor axes The semi-minor axis of an ellipse or hyperbola is a line segment that is at right angles with the semi-major axis and has one end at the center of the conic section.
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′12.8″ (or 23.4369°) and decreasing.