SEATTLE - Have you ever wondered why, for example, some calendars have the full moon this month listed as August 12, and other sources will have it as the 11th?
It all has to do with time zones -- specifically the old Greenwich Mean Time. Many calendars will list the moon phases (and dates the seasons change) as when it occurs at Greenwich Mean Time, which is 7 hours ahead of Pacific Daylight Time, and 8 hours ahead of Pacific Standard Time.
This month, the full moon was at 4:48 a.m. GMT on Aug. 12. But that's actually 9:48 p.m. on Aug. 11 in Seattle. So our full moon is Aug. 11, but it'll be listed as Aug. 12 in many sources.
You can find the exact times at this Web site -- aa.usno.navy.mil. Just be sure to adjust for GMT time.