- Update to version 1.29
  * Fix: the new Julian calendar feature was raising an 
    exception in the calendar methods like 
    `skyfield.timelib.Time.tt_calendar()` if the time 
    object was in fact an array of times. #450
  * Fix: trying to iterate over a time object would raise an 
    exception if the time was created through 
    `~skyfield.timelib.Timescale.ut1()`.
- Version 1.28
  * Broken URL: Because the VizieR archive apparently decided 
    to uncompress their copy of the hip_main.dat.gz Hipparcos 
    catalog file, the old URL now returns a 404 error. As an 
    emergency fix, this version of Skyfield switches to their 
    uncompressed hip_main.dat. Hopefully they don’t compress 
    it again and break the new URL! A more permanent solution 
    is discussed at: #454
  * To unblock this release, removed a few deprecated pre-1.0 
    experiments from April 2015 in skyfield.hipparcos and 
    skyfield.named_stars that broke because the Hipparcos 
    catalog is no longer compressed; hopefully no one was 
    using them.
  * In a sweeping internal change, the 
    `~skyfield.timelib.Timescale` and 
    `~skyfield.timelib.Time` objects now offer support 
    for the Julian calendar that’s used by historians for 
    dates preceding the adoption of the Gregorian calendar in 
    1582. See choice of calendars if you want to turn on 
    Julian dates in your application. #450

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