Drawn to scale, with a day going by every minute.
Low orbit is anything under 2,000 km: the ISS, Starlink and most of the rest, so close in that they skim the Earth's edge. A lap takes an hour and a half.
Medium orbit is where GPS, GLONASS and Galileo fly, about 20,000 km up, going round twice a day.
Geostationary orbit, 35,786 km up, takes exactly a day per lap, so a satellite there stays over one spot on the ground. Elektro-L and the other weather satellites work from here; on the sky chart they are the marks that never move.
Molniya orbits are long ellipses. A satellite crawls through the high end and hangs over the Arctic for hours, which is how Arktika-M and Meridian see the far north.
A free tracker that tells you when each of about 7,000 working satellites will next pass over you. That covers the ISS and Tiangong and the ships that visit them, Starlink, OneWeb and Iridium, every navigation system, weather satellites, Earth observers such as Landsat and Sentinel, and the Russian Cosmos series.
Orbits come from the element sets CelesTrak publishes, fetched every two hours. Your browser works out each position from them once a second, so nothing on the map is a recording.