../ dmsp_15_ephemeris_20190921.txt 22-Jun-2023 16:31 109568 dmsp_16_ephemeris_20190921.txt 22-Jun-2023 16:31 109644 dmsp_17_ephemeris_20190921.txt 22-Jun-2023 16:31 109634 dmsp_18_ephemeris_20190921.txt 22-Jun-2023 16:31 109605