Intercalation

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Related to Intercalary month: Embolismic month, Kipah

intercalation

[in‚tər·kə′lā·shən]
(geology)
A layer located between layers of different character.

Intercalation

 

the appearance of new structures and processes in an already formed life system. Examples of intercalation are the articulation of new stages alongside already existing ones in the process of individual development, the formation of secondary venules between the main ones in the wings of insects, and the formation of additional silica in diatomaceous algae.

References in periodicals archive ?
10) The earliest documented intercalary month in the Parthian Macedonian calendar is given by a tetradrachm of Orodes II with the date stamp TOP EM TI (assar 2003: 178, 182).
The calendars were periodically adjusted to keep the lunar months and the solar or natural year in some sort of alignment by adding "extra" or intercalary months.
New Year's dates are again plotted as a function of time in figure 2A; connecting lines pointing upwards represent years with an intercalary month.
An astronomical cycle, 19 years long, at the end of which the lunar and solar years coincided, determined when to add intercalary months.