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lib/cycles/cg/cg.md
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# CG: Ehlers Center of Gravity
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Cycle |
| **Inputs** | Source (close) |
| **Parameters** | `period` (default 10) |
| **Outputs** | Single series (Cg) |
| **Output range** | Varies (see docs) |
| **Warmup** | `period` bars |
### TL;DR
- CG identifies potential turning points using the physics concept of weighted center of mass applied to a price window.
- Parameterized by `period` (default 10).
- Output range: Varies (see docs).
- Requires `period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
CG identifies potential turning points using the physics concept of weighted center of mass applied to a price window. Developed by John Ehlers, the oscillator measures where the "weight" of prices is concentrated within a lookback period, producing a leading indicator that oscillates around zero with minimal lag compared to traditional moving average crossover systems.
## Historical Context