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).