../ dmsp_15_ephemeris_20210502.txt 22-Jun-2023 00:47 109604 dmsp_16_ephemeris_20210502.txt 22-Jun-2023 00:47 109570 dmsp_17_ephemeris_20210502.txt 22-Jun-2023 00:47 109652 dmsp_18_ephemeris_20210502.txt 22-Jun-2023 00:47 109613