Claude Johnson

Reference application for the main bodies of our solar system Ex. Aphelion, perihelion, eccentricity

26 animations to show you how to write your abc and an animation for the pronunciation

See what you would see in the eyepiece of your telescope. Enter the information about your telescope

It's 2 apps in 1 1. Local Sidereal Time Clock 2. Convert the Right Ascension and Declination of