I couldn't find what I wanted so I wrote my own and thought I'd make it available for anyone interested. I'm not after money so it is absolutely free! (and has no nasty ads, spyware, popups etc.)

The basic idea is a relatively (sorry!) simple calculator that will let you calculate interstellar journey times for starships travelling close to the speed of light. It will tell you how much time has elapsed in the universe and how much (little?) time has elapsed for the crew of the ship.

Your journey can be in multiple stages so for examples a two stage journey might start at rest and accelerate until the midpoint (stage 1) and then decelerate back to rest (stage 2). A three stage journey might have a "coasting" stage in the middle with zero acceleration.

You can download it here: http://www.focussoftware.co.uk/downloads/StarTraveller_Setup.exe

(I haven't bothered to create a web page for it so that is a direct link to the setup program).

Here's a couple of screenshots to give you an idea of what it looks like one is just the raw calculator for working out a stage and the other is a graphical representation of the whole journey. The vertical axis is velocity (both proper and map) and the horizontal axis is distance (with optional superimposed axes for map time and traveller time).

The basic idea is a relatively (sorry!) simple calculator that will let you calculate interstellar journey times for starships travelling close to the speed of light. It will tell you how much time has elapsed in the universe and how much (little?) time has elapsed for the crew of the ship.

Your journey can be in multiple stages so for examples a two stage journey might start at rest and accelerate until the midpoint (stage 1) and then decelerate back to rest (stage 2). A three stage journey might have a "coasting" stage in the middle with zero acceleration.

You can download it here: http://www.focussoftware.co.uk/downloads/StarTraveller_Setup.exe

(I haven't bothered to create a web page for it so that is a direct link to the setup program).

Here's a couple of screenshots to give you an idea of what it looks like one is just the raw calculator for working out a stage and the other is a graphical representation of the whole journey. The vertical axis is velocity (both proper and map) and the horizontal axis is distance (with optional superimposed axes for map time and traveller time).