Major purpose of this lecture is to present on Geometry. Geometry is the branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs. Geometry can be divided into: Plane Geometry: is about flat shapes like lines, circles and triangles; shapes that can be drawn on a piece of paper. Solid Geometry: is about three dimensional objects like cubes, prisms, cylinders and spheres. Finally focus on how could you describe geometrically the position of the moon, earth, and sun during a solar eclipse.