## Survey of aligned-spin binary black holes

The SXS collaboration has produced a catalog of about 90 simulations of binary black holes with spins aligned with the orbital angular momentum.  We sample systems with both spins co-rotating, one co-rotating and one counter-rotating, or both counter-rotating.  We compare these simulations with several waveform models in use by LIGO, and find generally excellent agreement.  The papers can be accessed arXiv:1512.06800  and arXiv:1601.05396.

## Inspiration

In the 1st year of the period Chih-ho, the 5th moon, the day chi-ch'ou, a guest star appeared...

Yang Wei-T'e, Imperial Astronomer of the Sung Dynasty, 1054 A.D.