[Orekit Users] Orekit 6.1 released

[MAISONOBE Luc <luc.maisonobe@c-s.fr>]

The Orekit team is pleased to announce that version 6.1 of Orekit has  
been released today.

Version 6.1 is a minor release of Orekit. It introduces several new  
features and bug fixes. The most important features introduced in  
version 6.1 are:

 - solid tides force model, including pole tide at user choice,
   and following either IERS 1996, IERS 2003 or IERS 2010 conventions
 - ocean tides force model, including pole tide at user choice,
   loading a user provided model
 - simultaneous support for IERS 1996, 2003 and 2010 for frames definition,
   which is very important to support legacy systems and to convert
   coordinates between older and newer reference systems
 - greatly improved accuracy of celestial/terrestrial frames transforms
   (we are now at sub-micro arcsecond level for IERS 2003/2010, both with
    equinox based and Non-Rotating Origin, at a sub-milli arcseconds for
    IERS 1996, both with equinox based and Non-Rotating Origin)
 - classical equinox-based paradigm and new non-rotating origin paradigm
   for inertial and terrestrial frames are now supported with all IERS
   conventions
 - automatic conversion of IERS Earth Orientation Paramters from equinoxial
   to non-rotating paradigm support for CCSDS Orbit Data Message
 - improved API for events, allowing separation of event detection and
   event handling (the older API is still available for compatibility)
 - merged all the elevation related events, allowing to use both refraction
   model and antenna mask at the same time if desired
 - new attitude mode based on interpolation on a table

Numerous bugs were also fixed.
Version 6.1 depends on version 3.2 of Apache commons math.

We want to thank everyone who as contributed to this release.


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