Geostationary Orbit Altitude Calculator
Imagine that you’re standing on Earth and there’s a satellite right over your head, parked perfectly still in the sky. For months, maybe even years, … Read More
JSCalc
Orbital Energy Calculator
To get something into low Earth orbit, you drop some serious money in fuel (millions of dollars per satellite). Then you send it high up … Read More
Apoapsis and Periapsis Calculator
It is a little geometry and a little energy. Two numbers, the farthest point (apoapsis) and the closest point (periapsis) (form the shape of an … Read More
Orbital Eccentricity Calculator
The shape of an orbit conveys much information. The easiest case is that of a perfect circle, but as we all know, nature doesn’t deal … Read More
Semi-Major Axis Calculator
An elliptical orbit is defined by its size: the semi-major axis. This are the average distance of a satellite to the body around which it … Read More
Orbital Velocity Calculator
Imagine how an object orbits. Think off throwing a baseball. Throw it hard, and it arcs to the ground. Throw it even harder, and it … Read More
Escape Velocity Calculator
The idea behind escape velocity is that it’s the speed at which an object will never again fall back down once propulsion stops. Think more … Read More
Relativistic Doppler Calculator
But the universe is not a sound wave reflecting off a speeding automobile. When you’re measuring the light coming from something traveling at a significant … Read More
Doppler Wavelength Shift Calculator
As light traverses space, it stretches and compresses in response to that journey. And that tells us what happened along the way. Called the Doppler … Read More
Age of the Universe Calculator
Light will show you things (but so too will the dark). You can learn much about the universe from the night sky. Each galaxy and … Read More