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In astronomy, an octaeteris (Greek: ὀκταετηρίς, plural: octaeterides) is the period of eight solar years after which the moon phase occurs on the same day of the year plus one or two days. This period is also in a very good synchronicity with five Venusian visibility cycles (the Venusian synodic period ) and thirteen Venusian ...
October 1: October 3 2012: Spring: April 28: April 30 Autumn: October 20: October 21 2013: Spring: April 20: April 18 Autumn: October 13: October 11 2014: Spring: May 10: May 7 Autumn: October 4: October 1 2015 Spring April 25 April 25 Autumn September 19 September 21 2016 Spring May 14 May 13 Autumn October 8 October 9 2017 Spring April 29 May ...
October 8 is the 281st day of the year (282nd in leap years) in the Gregorian calendar; 84 days remain until the end of the year. Events. Pre-1600. 316 ...
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A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.
It dates back to the ancient Roman calendar, known as the Republican calendar or the Calendar of Romulus. Under this system , the lunar calendar named only 10 months, excluding the winter season.
7–8 July Dashu: 120° 22–23 July Liqiu: 135° 7–8 August Chushu: 150° 23–24 August Bailu: 165° 7–8 September Qiufen: 180° 23–24 September Hanlu: 195° 8–9 October Shuangjiang: 210° 23–24 October Lidong: 225° 7–8 November Xiaoxue: 240° 22–23 November Daxue: 255° 7–8 December Dongzhi: 270° 21–22 December Xiaohan ...
Many know that the prefix oct- means eight, as in octopus or octagon. But why does October, the 10th month of the year, have this prefix?