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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Mark_M
actually if you download AGPS.zip from https://www.icofchina.com/xiazai/# and then translate Chinese docs, there are descriptions how to load Long Term Ephemeris data. I assume it is the larger DAT file in YYYYMM subdirectory.