Lunar calendar
A lunar calendar shows dates or phases connected with the Moon’s cycle. Phase depends on Sun-Earth-Moon geometry, not a personal sign.
How it is defined
The civil date of an exact phase varies with time zone. A phase calendar alone does not establish an eclipse’s visibility.
How to read it
To check the phenomenon, distinguish the calculated position, its reference time and what an observer can see from their location. These related details answer different questions.
A concrete example
If full Moon occurs near midnight, calendars for different zones may mark different days for the same astronomical instant.
Explore further
Explore the sources and related concepts. When consulting tables or calendars, look for the date, coordinates and reference frame they use.