# Session Summary: Exact Position Burn Execution

**Date:** 2026-02-21

## Changes Made

Implemented Option B from previous session's planning: exact position burn execution for true anomaly triggers.

### Core Implementation
- Added `scheduled_dt` field to `Maneuver` struct
- Modified trigger logic to set `scheduled_dt` when crossing detected
- Modified execution to propagate spacecraft to exact position before burn
- Added wraparound handling for 2π→0 periapsis crossing
- Added tracking array to prevent double-propagation in same frame

### Files Modified
- `src/maneuver.h` - Added scheduled_dt field
- `src/maneuver.cpp` - Trigger logic, cleanup
- `src/simulation.cpp` - Execution logic, tracking
- `src/config_loader.cpp` - Initialize scheduled_dt
- `tests/test_periapsis_burn.cpp` - Fixed tests
- `tests/test_periapsis_burn.toml` - Fixed config
- `tests/test_maneuver_planning.cpp` - Increased timeout
- `docs/planning/exact_position_burn_execution.md` - Planning doc

## Commits

```
680a8f4 Implement exact position burn execution for true anomaly triggers
```

## Results

- Net line count: +146 lines (207 additions, 61 deletions)
- All 143 tests passing
- Burns now execute at exact orbital position (within floating-point precision)

## Remaining Issues

None - all tests passing, implementation complete.

## Next Steps

Consider updating technical_reference.md to document the new `scheduled_dt` field in the Maneuver struct.