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** Maya calendar, the system of calendars and almanacs used in the Maya civilization
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** and Maya
** and calendar
** In modern times, although the Jewish calendar year number changes on Rosh Hashanah, the months are still numbered from Nisan.
** For horse-back riders there periodic events ( see their calendar of events ) and facilities include four horse rings and 140 stalls.
** In the 2 calendar months prior to the practical test, the candidate needs to log 3 hours of instrument training from a CFII in preparation for the test.
** and system
** Domestic: extensive microwave radio relay links ; domestic satellite system with 3 earth stations
** CCIR-tones, A selective calling system used in some radio communications systems in some European countries
** Romano-Germanic subgroup ( comprising those legal systems where legal science was formulated according to Roman Law-see also Civil law ( legal system ))
** A ground bus or earth bus is a conductor used as a zero voltage reference in a system, often connected to ground or earth.
** Digital filter, a system that performs mathematical operations to reduce or enhance certain aspects of a signal
** domestic: interisland microwave system and HF radio police net ; domestic satellite communications system
** ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script ( writing system ) independence, and hence useful for people or systems using non-Latin scripts.
** Domestic telephone system: a national fiber-optic cable interurban trunk system is nearing completion ; rural exchanges are being improved and expanded ; mobile cellular systems are being installed ; access to the Internet is available ;
** International telephone system: landline connections to Latvia and Poland ; major international connections are to Denmark, Sweden, and Norway by submarine cable for further transmission by satellite
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