Fiction:Virgo Birch Planet/Time

Temporal Manipulation Technology
The Virgo Birch Planet has a reasonable ability to manipulate the flow of time, although not as well as entities like the Taldar. This allows for accelerated computation and communication forwards and backwards through time, allowing the planet to operate in a limited sense as a four dimensional machine. This means that the concepts of "past" and "future" are less useful on the scale of planetary infrastructure and computing.

Realtivity
Relativity can be used to travel forward in time from the perspective of the traveler, or to make an object move more slowly through time from the perspective of an outside observer.

Special
The most basic form of time travel is to simply accelerate an object to a significant fraction of the speed of light so that, from its own perspective, time in the outside universe moves at an accelerated rate. This allows the object to travel into the future.

General
A similar effect can be achieved by getting close to the event horizon of a black hole. Specialized vessels called Murphy ships are sent on trajectories through the Void Mantle around Azathoth-3S to emerge years later from an outside perspective, but only hours later from the perspective of the ship. Black holes canalso be used to store short-lived phenomena for long periods to slow decay until they are needed. These temporal stasis units are especially useful for storing unstable particles.

Superluminal Time Travel
Hyperdrives, Wormholes, and Krasnikov tubes all allow backwards time travel. Gigantic computational nodes are responsible for calculating the precise changes that can be made to the "past" to bring about the exact desired change in the "future". This can be used send preemptive reports on the success of an action back to before the action was performed to inform whether it should be performed. A calculation can also be started and then the result sent back to the point where the calculation began so that no time needs to be waited. This requires immense energy however, as hypermatter currents in hyperspace will hinder anti-temporal trajectories and must be fought against.

Chronostatic Dirigibles.
Inside a black hole, the roles of time and space switch where the singularity is an inevitable point in the future. However, there exist superluminal trajectories where an object doesn't move towards the singularity because it remains static at the same point in time. These devices allow structure to exist below the event horizon of the black hole without being sucked into the singularity

Chronoscopic Time Manipulation
The Virgo Birch Planet has limited access to Chronoscopic Essence, which is one of the very few substances that is truly scarce and valuable to it. This has been incorporated into many different Clarktech devices that allow much freer time manipulation.

Timeline Editing
Chronoscopic Essence can be used to manipulate the timeline in a local area, allowing removal or addition of elements that weren't there before. Dedicated Matrioska computer nodes are used to catalog and predict all the interactions between elements so no mistakes are made.

Tachyons
Tachyons are Cronoscopic-infused particles that travel faster than light and back in time. They can be used to easily send messages back in time without the use of a wormhole, or to send information out of the event horizon of a black hole.

Causative Uncoupling (Bootstrapping)
Perhaps the most impressive power afforded to the planet by Chronoscopic Essence is bootstrapping. In this process the existence of an object is made to no longer depend on the existence of past states by going back in time and providing an alternate mechanism for its creation that originates from the object itself (e.g. going back in time to plant a tree using a seed that fell from the same tree in the future). This acts as a defense for the planet where time-faring species cannot destroy it by traveling back in time and destroying the planet's progenitor races before they were powerful enough to put up a fight.

This process is only possible with Chronoscopic Essence as it is non-quantum mechanical and can prevent the exponential entropy increase that would result from the same object cycling through time forever.