<commit_before>=======================
The Skyfield To-Do List
=======================

This list includes both a section on immediately-reachable goals that
are appropriate for sprints and collaboration, and longer-term goals
that the code base is not quite ready for yet but that we do not want to
forget.

Sprint Possibilities
====================

* Improve the situation around “observer data”.

  * We currently special-case two components of the full
    center-to-target vector: the barycenter-to-target vector for things
    like deflection, aberration, and like magnitude being affected by
    distance from the sun; and Earth-to-target, for Earth deflection.<commit_msg>Add a TODO item<commit_after>=======================
The Skyfield To-Do List
=======================

This list includes both a section on immediately-reachable goals that
are appropriate for sprints and collaboration, and longer-term goals
that the code base is not quite ready for yet but that we do not want to
forget.

Sprint Possibilities
====================

* Should the deflection routine really say this instead?:

```
            limb_angle, nadir_angle = compute_limb_angle(
                target_au + gcrs_position, gcrs_position)
```

* Improve the situation around “observer data”.

  * We currently special-case two components of the full
    center-to-target vector: the barycenter-to-target vector for things
    like deflection, aberration, and like magnitude being affected by
    distance from the sun; and Earth-to-target, for Earth deflection.
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