Should `height` be returned in the EarthLocation unit?  Here I gave inputs in `km` and got them back in `m`.
```
>>> e = EarthLocation.from_geocentric(x=[1e4,1e4,1e4], y=[1e4,1e4,1e4], z=[2e4,2e4,2e4], unit='km')
>>> e.height
<Quantity [ 10949503.0597968, 10949503.0597968, 10949503.0597968] m>
```