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The phase of interplanetary trade, or just phase of trade, is the set of interplanetary transfer windows (time periods near when it takes the least energy to travel to another planet) that are planned around in order to elicit the highest profits from the interplanetary cargo shipping industry. Phase of trade usually refers to interplanetary trade between Kepule and Tellus.
The phases of trade are as follows; Kepule-bound, Tellus-bound, and stagnant. Kepule-bound phase indicates that vessels are traveling from Tellus to Kepule. Tellus-bound phase indicates that vessels are traveling from Kepule to Tellus. Stagnant phase indicates that trade is not being conducted en mass.
A simplified example of a Hohmann transfer from Tellus to Kepule in Kepule-bound phase.
Because phase of trade is based on the position of the planets, and because the planets' orbits do not change, the times of phases can be mathematically determined. The order will remain the same while cycling through each phase. The cycle starts with stagnant phase, followed by Kepule-bound phase, followed by Tellus-bound phase, and then restarts. Kepule-bound phase precedes Tellus-bound phase because its orbit is lower than Kepule's, and therefore faster.
In Kepule's Gravity Well
In Kepule's Gravity Well
A smaller version of the phase of trade exists relating to the moons of Kepule, primarily Tandua and Terrisus. Because the orbital periods of these moons are so much smaller than those of the planets, their phase of trade is never stagnant for more than a day at a time. Because of this, and the fact that far less ΔV is required for interlunar travel, the phase of trade of Tandua and Terrisus is significantly less important than that of Kepule and Terrisus when planning a vessel's route.
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