orbital instrument / field notes
The centre holds. The orbits answer.
Exode is an orbital instrument in the browser. You place a Moment around a fixed centre. Its distance enters a law. The law returns a period. The period becomes motion. The orbit is solved from time itself, so it does not drift.
The hand sets the geometry. The instrument reveals the rhythm.
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01
Place
Place one Moment at a distance and angle. Distance is measured in arca. Near returns sooner; far returns later. You decide where the Moment belongs. Exode makes that choice visible as time.
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02
Law
Keep the Moment where it is and change the law. The same distance can produce a different period. Its present angle holds while its speed changes. Harmonic, exponential, and linear are correspondence laws. Kepler uses the physical distance–period relation.
harmonic P(T) = 20 × 2^Texponential P(T) = 2 × 1.66^Tlinear P(T) = 2 + T × (10 800 − 2)kepler P(T) = k × T^(3/2) -
03
Scale
Zoom changes how much arca is visible. It changes the view, not the map. Every Moment keeps its radius, law, period, and present angle. Maximum zoom is a limit of the view, not of space.
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04
Turn
Reverse the turn. The Moment keeps its present position. Distance and period also hold; the next instant carries it the other way.
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05
Model
Summon a model: a prepared system of Moments added to the same field. Edit one Kepler member’s period and the model’s Kepler constant is recalibrated. Its Kepler members change period together; radii and present angles do not move. Personal Moments and other models keep their own rhythms.