Landsat satellites have traditionally imaged the Earth's surface in midmorning orbit, but now Landsat 8 and 9 are also utilizing their ascending paths to capture nighttime images. This new capability expands the science value of the Landsat program. The addition of nighttime imaging allows for a more comprehensive understanding of the Earth's surface.

Source: https://science.nasa.gov/missions/landsat/nighttime-imaging-grows-landsats-science-value/