HOW OLD IS THE LIGHT FROM THE STARS?

https://uk.rs-online.com/web/generalDisplay.html?id=i/how-old-is-the-light-from-the-stars

http://www.skyandtelescope.com/observing/new-interactive-constellation-guide-takes-you-back-in-time/

Every time we look at the Sun we see it as it was 8.3 light-minutes ago. 

Bob King

Easy-peasy time travel

It's fun-house mirror time! As we travel through time backwards and forwards, Sagittarius is transformed.

Courtesy of Tony Dunn with additions by author

Orbit Simulator

http://orbitsimulator.com/gravitySimulatorCloud/stars.html?12,15,25.6,57,1,57.4,1000,2000,100,0,100,0.2,5,0,1,0,1,15,0.5,0000ff,0,0,1,0,1,4,85,1,4,30,1,4,170,1,4,255,1,4,340,1,4,465,1,4,530,1,4,660,1,260,30,1,260,200,14,1,515,30,0.5,92f50a,1,0,0,0