../ dmsp_15_ephemeris_20210430.txt 22-Jun-2023 16:35 109593 dmsp_16_ephemeris_20210430.txt 22-Jun-2023 16:35 109609 dmsp_17_ephemeris_20210430.txt 22-Jun-2023 16:35 109620 dmsp_18_ephemeris_20210430.txt 22-Jun-2023 16:35 109504