This one knew about the ‘leap’ month - זה ידע בעיבורו של חדש
Summary:
A contradictory testimony (זה אומר בג וזה אומר בה) cannot be reconciled by a subsequent testimony (יום אחד בשבוע), for it is considered חוזר ומגיד. However if the initial contradictory testimony (זה אומר בב וזה אומר בג) can be reconciled on its own by assuming the רוב people make this error (רובא טעי בעיבורא דירחא), the testimony is not considered contradictory (for הולכין אחר הרוב בדיני נפשות), and is accepted if it is later verified that indeed it was not contradictory (by מכוונים ליום השבוע).
Summary:
The נץ החמה takes place one and a half hours after עלות השחר. Nevertheless people may assume that the second hour begins after הנץ החמה. When a person testifies that an incident took place in the beginning of the second hour we cannot infer that he means it took place before הנץ החמה.
