Simulation Speed

The Simulation Speed is a simulation setting representing how much simulation time passes every real-time second. For example, if the Simulation Speed is set to one month per second, then a month passes in the simulation every real-time second, and it will take Earth about 12 real-time seconds to orbit the Sun. While the user can set their desired Target Simulation Speed, the actual Simulation Speed at any point will be set automatically by Universe Sandbox to balance accuracy and performance (see Accuracy and Speed below).

Location
The Simulation Speed setting is located in the bottom bar.

Units
Simulation Speed can viewed and edited using the following units:
 * Gigayears per real-time second (G years/sec) = 109 years/sec
 * Megayears per real-time second (M years/sec) = 106 years/sec
 * Years per real-time second (years/sec) = 365.25 days/sec
 * Months per real-time second (months/sec) = 1/12 years/sec
 * Days per real-time second (days/sec) = 24 hours/sec
 * Hours per real-time second (hours/sec) = 60 mins/sec
 * Minutes per real-time second (mins/sec) = 60 sec/sec
 * Seconds per real-time second (sec/sec) means the simulation is running in real time
 * Milliseconds per real-time second (ms/sec) = 0.001 sec/sec

Accuracy and Speed
Generally, the higher the Simulation Speed, the lower the accuracy of the simulation. For example, if the N-body simulation is too inaccurate, then orbits will fall apart. Conversely, higher Simulation Speeds will cause the simulation to run faster, so there is a trade-off between speed and accuracy.