sgp 1.0.1

Simplified General Perturbations models (SGP8/SGP4) in Rust.
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# SGP in Rust

A simple implementation of the Simplified General Perturbations models (SGP8/SGP4) in Rust.

The results are validated against the original MATLAB implementations:

- [Original MATLAB SGP8 reference](<https://www.mathworks.com/matlabcentral/fileexchange/75492-sgp8/>)
- [Original MATLAB SGP4 reference](<https://www.mathworks.com/matlabcentral/fileexchange/62013-sgp4>)


## License

This project is licensed under the GNU General Public License v3.0 only (GPL-3.0-only). See the [LICENSE](LICENSE) file for details.

## Usage

Simple usage example:

```rust
use sgp::sgp4;

let tle_line1 = "1 25544U 98067A   20344.91667824  .00016717  00000-0  10270-3 0  9003";
let tle_line2 = "2 25544  51.6442 348.7413 0002393  85.0646 325.0584 15.49325993257145";

let (position, velocity) = sgp4::propagate(tle_line1, tle_line2, 60.0); 
// Propagate to 60 minutes after epoch

println!("Position (km): {:?}", position);
println!("Velocity (km/s): {:?}", velocity);
```

For SGP8 usage, use `sgp::sgp8` just like `sgp::sgp4`.