Cosmotrek: Space Travel Time

Cosmotrek answers the questions you ask when you look at the night sky: how far away is Mars today, how long does light take to get there, and how long would a trip take at the speed of a spacecraft?

Key features
• Solar System: distance from Earth and from the Sun for every planet on any date from 1800 to 2050, with the one-way light time
• A top-down map of the planets with a time-lapse from 10 days to one year per second
• Travel Time: pick the Moon, a planet or a nearby star, then a speed such as the ISS, Apollo, Voyager 1, Parker Solar Probe, a fraction of light speed or your own value
• A light race that shows how far light gets while your vehicle is still near Earth
• Transfer: Earth-to-planet transfer time, speed change, time between launch windows and the next window (a Hohmann model)
• Share any result as plain text

Every answer names the model behind it. Planet positions come from NASA/JPL mean orbital elements (about 0.01 AU), star distances are rounded published values, and trips are straight lines at constant speed, so treat the numbers as estimates, not mission data.

Sources (NASA/JPL):
• Keplerian Elements for Approximate Positions of the Major Planets: https://ssd.jpl.nasa.gov/planets/approx_pos.html
NASA and mission names are used for identification only. Cosmotrek is not affiliated with or endorsed by NASA or any space agency.