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**Landsat continuity — the modern pair.** - **Landsat 8** launched **February 11, 2013**. - **Landsat 9** launched **September 27, 2021**. - Landsat 8 and 9 fly **offset by 8 days** (not 12 h as some older slides state), giving the combined constellation an **8-day** effective revisit. - Both carry **OLI + TIRS** (OLI-2 + TIRS-2 on Landsat 9).

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