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In astronomy new Moon, first quarter, full Moon and Last quarter are defined as the times at which the excess of the apparent celestial longitude of the Moon over that of the Sun is 0°, 90°, 180° and 270° respectively.   New Moon of 2003 Aug 27 Apparent Geocentric Longitude (True Equinox and Ecliptic of Date) UT Sun Moon 17:26:15 154' 01' 57.5'' 154° 01' 57.0'' 17:26:16 154° 01' 57.6'' 154° 01 57.5'' 17:26:17 154° 01' 57.6'' 154° 01' 58.1'' Full Moon of 2003 Aug 12 Apparent Geocentric Longitude (True Equinox and Ecliptic of Date) UT Sun Moon δL 12 04:48:07 139° 05' 24.7'' 319° 05' 24.0'' 179° 59' 59.3'' 12 04:48:08 139° 05' 24.7'' 319° 05' 24.6'' 179° 59' 59.9'' 12 04:48:09 139° 05' 24.7'' 319° 05' 25.2'' 180° 00' 00.5'' Data computed by: MICA (Multiyear Interactive Computer Almanac) for Macintosh 1990-2005 (Astronomical Applications Dept. U. S. Naval Observatory, Washington) © 1985-1992 Apple Computer Inc. The approximate dates of New Moon and Full Moon can be read from the azimuth diagram of my applet: for New Moon the azimuth angles of the Sun and the Moon at rise are close together (intersection of the curves): Dates of New Moon 2003 for Full Moon the azimuth angles of the Sun and the Moon differ by about 180° (intersection of the curves for sunset and moonrise or sunrise and moonset): Dates of Full Moon 2003   2003 Jan 2 at 08:17 CET in Berlin   2003 August 27 at 05:08 CET in Berlin   Updated: 2007, Oct 16