👉 The term "apsidal" in geometry refers to a point that is part of an arc or line segment connecting two points. It is often used in trigonometry and astronomy when discussing the properties of angles formed by intersecting lines, such as the angle between two straight lines. The apsidal angle is defined as the measure of the angle formed at the apex (the highest point) of a triangle that intersects a line parallel to the base. Apsidal angles are crucial in understanding