Old Style calendar

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Noun1.Old Style calendar - the solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus, establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February
solar calendar - a calendar based on solar cycles
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References in periodicals archive ?
In 1492 (according to the Old Style calendar), Christopher Columbus arrived with his expedition in the present-day Bahamas.
The first Book of Fairs gave details of over three thousand fairs, almost three times as many as the previous best list (that published in Rider's almanac for 1750).(108) Half of those in Rider are traceable in Owen, of which 73 per cent followed the Act and the Old Style calendar, 25 per cent followed the New Style, and 2 per cent were altered in other ways.(109) A seasonal breakdown of these changes yields interesting results.
But this is according to the Old Style calendar, when the new year began on 25 March, Lady Day.