Lunar eclipse
A lunar eclipse occurs when the Moon passes through Earth’s shadow. It requires full Moon and alignment near the lunar nodes.
How it is defined
Full phase is necessary but insufficient. Eclipses can be penumbral, partial or total; observation requires the Moon to be above the local horizon.
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 a calendar announces an eclipse, check local visibility. Symbolic references to endings or changes do not establish that a particular event will happen to you.
Explore further
Explore the sources and related concepts. When consulting tables or calendars, look for the date, coordinates and reference frame they use.