../ dmsp_15_ephemeris_20211217.txt 22-Jun-2023 00:49 109456 dmsp_16_ephemeris_20211217.txt 22-Jun-2023 00:49 109355 dmsp_17_ephemeris_20211217.txt 22-Jun-2023 00:49 109339 dmsp_18_ephemeris_20211217.txt 22-Jun-2023 00:49 109300