The most common type of pre-modern calendar was the lunisolar calendar, a lunar calendar that occasionally adds one intercalary month to remain synchronised with the solar year over the long term.
Amongst such calendar systems was the calendar system of the Persian Empire, which in turn gave rise to the Zoroastrian calendar as well as the Hebrew calendar.
A great number of Hellenic calendars developed in Classical Greece, and with the Hellenistic period also influenced calendars outside of the immediate sphere of Greek influence, giving rise to the various Hindu calendars as well as to the ancient Roman calendar.
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The course of the Sun and the Moon are the most evident forms of timekeeping, and the year and lunation were most commonly used in pre-modern societies worldwide as time units.
Nevertheless, the Roman calendar contained very ancient remnants of a pre-Etruscan 10-month solar year.A date is the designation of a single, specific day within such a system.A calendar is also a physical record (often paper) of such a system.Calendars in antiquity were lunisolar, depending on the introduction of intercalary months to align the solar and the lunar years.This was mostly based on observation, but there may have been early attempts to model the pattern of intercalation algorithmically, as evidenced in the fragmentary 2nd-century Coligny calendar.Viel Vergnügen auf dem Weg zum Fotografie-Experten wünschen Ihnen der Architekt, Fotograf und Buchautor Martin Zurmühle.