../ dmsp_15_ephemeris_20210720.txt 22-Jun-2023 16:36 109473 dmsp_16_ephemeris_20210720.txt 22-Jun-2023 16:36 109553 dmsp_17_ephemeris_20210720.txt 22-Jun-2023 16:36 109750 dmsp_18_ephemeris_20210720.txt 22-Jun-2023 16:36 109507