Tidal Force Calculator
If you were standing on the Moon’s surface, you’d be looking back at Earth. It is a beautiful blue world suspended in the darkness. It … Read More
JSCalc
Hill Sphere Radius Calculator
When we think about gravitational force of a planet, it’s easy to think of it as basic sphere. Imagine that there’s a transparent bubble and … Read More
Roche Limit Calculator
When one thinks about a satellite orbiting a planet on a normal orbit, think again: what happens if tidal forces get too high? If gravity … Read More
Gravitational Potential Energy in Orbit Calculator
We usually think of gravity as a force that pulls us down. But it is more complex than that; it is actualy the opposite of … Read More
Gravitational Acceleration Calculator
Think about it: Gravity is something you consider to be pretty much constant. Like your fridge humming in the background, right? Because you live on … Read More
Weight on Another Planet Calculator
Your weight is never set in stone. At least not unless you’re on Earth. Weight is simply an indication of the gravitational force acting upon … Read More
Launch Window Duration Calculator
Think about the rocket on the pad at that moment. The fueled, cold engines is waiting for command to fire. He is waiting for the … Read More
Payload Fraction Calculator
When rockets sits on launchpad, they’re huge in terms of total mass. They have engines, tanks, fuel, and more. When you put them up, that’s … Read More
Burn Time Calculator for Rocket Motors
It’s launch day. You’re standing at the launch pad with a rocket strapped into place. The engine fires up, the ground drops from beneath you, … Read More
Propellant Mass Calculator for Rocket Stages
When propellant is factored in to the math, rocket design goes from being an abstraction to something practical. You realize that each kilo of fuel … Read More