deep space - What does NASA mean when they use the term 'PDT (ERT)' - Space Exploration Stack Exchange

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In a graphic describing Cassini's final approach to Saturn NASA lists the timestamps as 4:55 am PDT (ERT). What does this mean? I am assuming that PDT mean pacific time, but I can't find out what
deep space - What does NASA mean when they use the term 'PDT (ERT)' - Space  Exploration Stack Exchange
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