4.6.0

• Merged the part1() and part2() functions of all integerators into a single step() function. Integrators are now responsible for updating accelerations when needed. Although a big change under the hood, this should not affect users.

4.5.1

• Added leapfrog integrators of order 4, 6, and 8. Order can be set with r->ri_leapfrog->order.
• Heartbeat function is now also called when using reb_simulation_steps().
• OrbitPlot supports more colours.
• Fixed an alignment issue when comparing binary snapshots which could have triggered a segfault.

4.5.0

• Added support for (Frequency) Modified Fourier Transforms. Heavily based on David Nesvorny's code. The new functions are reb_frequency_analysis() in C and rebound.frequency_analysis() in python. For usage, see C examples secular_frequencies and frequency_analysis as well as the iPython notebook FrequencyAnalysis.
• Support for Jacobi coordinates added when using WHFast with OpenMP.
• Allow negative periods when initializing hyperbolic orbits.

4.4.11

• The collision resolve function now returns a type enum REB_COLLISION_RESOLVE_OUTCOME. The actual integer values remain unchanged.
• Bug in TRACE was fixed.
• Convergence check for M_to_E function.
• New API example that shows how to use the Kepler solver without a REBOUND simulation. Updated other examples.

4.4.10

• Version bump to rerun github workflows for pypi uploads

4.4.9

• Fixes a bug that affected collisions searches with a tree code.
• Support for mid-timestep add/remove of particles with TRACE.
• Various small improvements and bugfixes for TRACE.
• IAS15's adaptive_mode is now an ENUM.
• Some OpenMP improvements.

4.4.8

• Added support for symplectic correctors with barycentric coordinates in WHFast.

4.4.7

• Added option to disable SSL checks for Horizon queries with rebound.horizons.SSL_CONTEXT = 'unverified'.
• Added unit tests.
• Added barycentric coordinates for WHFast.
• Bug fix for when MEGNO is used with adaptive timestepping.
• Added more error messages.
• Fixed various issues in documentation.

4.4.6

• When initializing particles with "uniform" in python, REBOUND now uses its own reb_random_uniform() function. This avoids importing the "random" library and makes results reproducible as the random seed of the simulation is used when generating random numbers.
• More cracefull interrupt handling. REBOUND now stop the integration after the next timestep when CTRL-C is pressed the first time. If CTRL-C s pressed twice, then long loops (during gravity, collision calculations) are terminated immediately. Continuing an integration after one CTRL-C press should be easier with this change as the simulation does not get corrupted.
• Fixed typos in documentation.

4.4.5

• Version updated to test github workflows