# `Sidereon.Estimation.TrackRtsHistory`
[🔗](https://github.com/neilberkman/sidereon-ex/blob/main/lib/sidereon/estimation.ex#L432)

Recorded forward-filter history accepted by the RTS smoother.

# `t`

```elixir
@type t() :: %Sidereon.Estimation.TrackRtsHistory{handle: reference()}
```

# `epoch_count`

```elixir
@spec epoch_count(t()) :: non_neg_integer()
```

Return the number of recorded epochs.

# `epochs`

```elixir
@spec epochs(t()) :: [Sidereon.Estimation.TrackRtsEpoch.t()]
```

Return recorded epochs as Elixir structs.

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*Consult [api-reference.md](api-reference.md) for complete listing*