You don’t need Stefan to answer your eclipse question. it is simple Physics with a mathematical equation. A closed curve that is symmetric with respect to two perpendicular axes, this is related to line of sight principle similar to a Rainbow (or Prism to give it the proper name).. You are seeing sunlight refracting through water (rain) which the eyes interpret.
In the film Independence Day, Jeff Goldblum used the same theory of triangulation when the aliens were using our satellites against our planet… No google was used in this answer.