Earth Curvature Calculator
"Horizzn is a simple, accurate, and beautiful Earth Curvature Calculator. Calculating the Earth curvature with Horizzn Calculator is a simple two-step process. We recommend you use Horizzn out in the open with a clear sight to the horizon so you can try and match your calculations with real-life observations.
The 100% Vue App includes: Vue.js, Vue CLI, VueRouter and Webpack."