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The recently published Yemeni observation report about SN 1006 from al‐Yamānī clearly gives AD 1006 April 17 ± 2 (mid‐Rajab 396h) as the first observation date. Since this is ∼1.5 weeks earlier than the otherwise earliest reports (April 28 or 30) as discussed so far, we were motivated to investigate an early sighting in more depth. We searched for additional evidences from other areas like East Asia and Europe. We found that the date given by al‐Yamānī is fully consistent with other evidence, including the following: (a) SN 1006  rose several times half an hour after sunset  (al‐Yamānī), which is correct for the location of Ṣan  c  ā' in Yemen for the time around April 17, but it would not be correct for late April or early May. (b) The date ( third year, third lunar month, 28th day wuzi, Ichidai Yoki ) for an observation of a guest star in Japan is inconsistent (there is no day  wuzi  in that lunar month), but may be dated to April 16 by reading a  wuwu  date rather than a  wuzi  date. (c) There is observational evidence that SN 1006 was observed in East Asia in early or mid‐April; for the second half of April, a bad weather (early monsoon) period is not unlikely— there is a lack of night reports. (d) The observer in St. Gallen reported to have seen SN 1006  for 3 months , which must have ended at the very latest on AD 1006 July 10, given his northern location, so that his observations probably started in April. We conclude that the correctly reported details give quite high confidence in the fully self‐consistent report of al‐Yamānī, so that the early discovery date should be considered seriously.

Interpretation of the historic Yemeni reports of supernova SN 1006: Early discovery in mid‐April 1006?