👉 Secno is a term that refers to the number of seconds it takes for light to travel from Earth to the sun. It was first defined by astronomer Johannes Kepler in his work "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Celestial Spheres). The secno value is used in astronomy and physics to measure distances, such as the distance between two stars or the time it takes for light to travel from one place to another.
