../ dmsp_15_ephemeris_20180901.txt 22-Jun-2023 00:38 109573 dmsp_16_ephemeris_20180901.txt 22-Jun-2023 00:38 109553 dmsp_17_ephemeris_20180901.txt 22-Jun-2023 00:38 109634 dmsp_18_ephemeris_20180901.txt 22-Jun-2023 00:38 109538