Extra fields in a time object

skyfielders / python-skyfield

Elegant astronomy for Python

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Extra fields in a time object #232

Closed donalmur closed 5 years ago

donalmur commented 5 years ago

Hi I noted that there are some extra fields in the time object such as .P, .N, .NT etc. These seem to be the Precession matrix ,Nutation matrix, What are the Tvaraiants? Is it Transpose? The reason that I ask in that I am trying to make a force module for orbit propagation and need to often translate between ITRF and ICRF having access to Rm Rs N and P would be great. r(ITRF)=RmRsNP r(ICRF) Any info is appreciated.

donalmur commented 5 years ago

Sorry I found the info in the API Dates and Times info

brandon-rhodes commented 5 years ago

I'm glad you were able to find the documentation! Let me know if you think of ways I could make it easier to find, and I hope Skyfield works well for you.