"David Grossmann" kirjoitti
glegroups.com...

I have heard every 19 years (235 lunar months) the moon and the solar
year are synchronised. However, after looking at the times for new
moons in the almanacs, and comparing new moon times with a year and a
year 19 years later, the new moon can be off as much as one day.

The 19-year cycle (known as Meton-cycle after an astronomer in Athens - who
probably learned of the concept from Babylonians that had based their
calender on it since 383 BC) is real. However:

a) It isn't quite accurate - there is a difference of apprximately 2 hours.
b) 235 average lunar months is almost exactly 19 years - but not all months
are average. The length of synodic month can vary approximately up to 6
hours.

Either of these effects or combination thereof could be the source of the
difference. You didn't specify the years (or the time zone), so I can not
verify that this is the case.

A calendar of Moon phases is available at:

http://aa.usno.navy.mil/data/docs/MoonPhase.html

to the accuracy of minutes.

H Tavaila