Phases of the Moon: 1861 to 2020

Short introduction about the used codes

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The table on previous pages gives the date and time (Greenwich Mean Time) of all phases of the Moon for the indicated period. This data is provided primarily to assist in historical research projects. For the year 2000, the length of the mean synodic month (New Moon to New Moon) is 29.53059 days.

Delta T is listed in the last column on the right. This is the value used to convert Ephemeris Time to Universal Time (i.e. - Greenwich Mean Time) in the tables. Estimated values for other times are based primarily on historic eclipse records (past) or extrapolation of current rates (future):

The table also indicates whether or not an eclipse of the Sun or Moon occurred on the date in question and gives the eclipse type. Note that an eclipse of the Sun can occur only at New Moon, while an eclipse of the Moon can occur only at Full Moon. In any calendar year there are between 2 to 5 eclipses of each kind (solar and lunar, including penumbral). However, there cannot be any more than 7 eclipses in any one year (4 solar and 3 lunar, or 5 solar and 2 lunar).

Solar                                        Lunar
Eclipses:  T - Total                         Eclipses:  t - Total (Umbral)
           A - Annular                                  p - Partial (Umbral)
           H - Hybrid (Annular/Total)                   n - Penumbral
           P - Partial

Algorithms used in predicting the phases of the Moon as well as eclipses are based on Jean Meeus' Astronomical Algorithms (Willmann-Bell, Inc., Richmond, 1991). All calculations are by Fred Espenak (USA), and he assumes full responsibility for their accuracy.

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