Jerónimo Muñoz, a 16th-century Valencian astronomer, made important observations of the supernova that exploded in 1572, as well as eclipses, stars, and extremely precise maps.
We call a mirage seeing objects where they are not. It is an optical illusion that can be seen on very hot days and in places like deserts. Inmaculada Pascual Villalobos explains this and tells us about the «Fata Morgana» effect.
Rarely does pseudoscience address the formation of aircraft trails in the sky. These trails are usually discussed by conspiracy theorists, rather than by pseudoscience.