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http://en.wikipedia.org/wiki/Julian_day

Days since the beginning of the Julian Period The Julian day is a continuous count of days from the beginning of the Julian period; it is used primarily by astronomers , and in software for easily calculating elapsed days between two events (e.g., food production date and expirat…

https://en.wikipedia.org/wiki/Leap_Year

Calendar year with a day (or month) added A leap year (also known as an intercalary year or bissextile year [ a ] ) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar , a month) compared to a common year . The 366th day (or 13th month) is …

https://en.wikipedia.org/wiki/Leap_year

Calendar year with a day (or month) added A leap year (also known as an intercalary year or bissextile year [ a ] ) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar , a month) compared to a common year . The 366th day (or 13th month) is …

https://www.academia.edu/76310182/The_orientation_of_cistercian_churches_in_Wales_A_cultur…

THE ORIENTATION OF CISTERCIAN CHURCHES IN WALES: A CULTURAL ASTRONOMY CASE STUDY Bernadette Brady, Darrelyn Gunzburg, and Fabio Silva* The union of sun, landscape, and architecture contribute collectively to the s­iting of Welsh Cistercian abbeys. By taking into account the topog…