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Celestia/Time Control
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There are several keys that can be used to control the rate and direction of the passage of time.
Table of keys
Key Effect J Reverse time K Decrease rate by 10x Shift+K Decrease rate by 2x (new in version 1.5.0) L Increase rate by 10x Shift+L Increase rate by 2x (new in version 1.5.0) Space Stop time ! Set time to the computer's current time ? Display travel time for light between observer and selected object - Subtract the above light travel time from Celestia's current time \ Set time to real time