../ dmsp_15_ephemeris_20230421.txt 22-Jun-2023 16:42 243 dmsp_16_ephemeris_20230421.txt 22-Jun-2023 16:42 243 dmsp_17_ephemeris_20230421.txt 22-Jun-2023 16:42 243 dmsp_18_ephemeris_20230421.txt 22-Jun-2023 16:42 243