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Epoch to utc12/2/2023 What is that?Įxample 2 TLE epoch: from skyfield.api import now, JulianDate, loadġ 25544U 98067A 16031.25992506. There is a difference of about 69 seconds. I print additional information to make sure I understand some things - the questions are in bold:Įxample 1 - time on my computer and in Skyfield: from skyfield.api import now, JulianDate, loadĪ, b = now(), time.gmtime() # check the times Here are two examples of situations where I feel lost. If I line up UTC agains Julian Day are they parallel (except for UTC's leap years/seconds)? Is there a mapping that I can understand or do I have to use a computer program or web site or some other black box to convert between the two? That links to a long article which states many facts, but after reading, I still don't understand what it is quantitatively. I roughly understand that UTC increase by 1 second every second, with the usual rules for hours, minutes, days, years, leap years and leap seconds. But here what I need is just a bare-bones understanding of how these three things are related quantitatively, on earth, plus/minus a few years from now, to milli-second accuracy. It's a deep subject, especially if you include relativity, and a long subject - there is a lot of history. I am trying to understand the relationship (quantitatively) between JulianDate, UTC, and the epoch of Two Line Elements.
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