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Medieval Calendars were kinds of calendars used in Medieval Europe, consisting of the Catholic calendar of saints. The majority were Julian Calendars until the switch to the Gregorian calendar in 1582. They were commonly found at the beginning of books of hours.

Current Australian Commonwealth ministry

Description
The common medieval calendar contained a page of each month (January to December), listing the Christian feast days (the majority of which being feasts of Saints. The relative importance of feast days was indicated due to colour of the ink used, with the most common in black and the more important in red, blue or gold. This is the source of the expression red letter days, referring to days of importance.

To the left of the feast days were the Dominical letters, a series of letters from A to G. These allowed the user to determine the days of the week for each month. Each year the letter corresponding to Sunday (and the other letters) changed to the previous letter in the sequence, except on leap years where the letter reversed twice. Alternatively, if the user did not know the Dominical letter from the previous year, it could be calculated by taking the year, adding this to the quarter of year and ignoring the remainder. Next this was divided by 7 and the remainder was then subtracted from 3, or 10 if that equals 0 or a negative number. The number then gives your the Dominical letter for Sunday (A=1, B=2...)

$$ 3- \left( {Y+\left\lfloor \frac{Y}{4} \right\rfloor} \right) \mod 7 $$ or if this is negative or zero:

$$ 10- \left( {Y+\left\lfloor \frac{Y}{4} \right\rfloor} \right) \mod 7 $$

Many calendars also include a column of Roman numerals corresponding to the [[go

Great Seal of Australia
The great seal of Australia is one of Australia's national symbols. It is sometimes used on important documents to demonstrate the approval of the Commonwealth. The current design was authorised by royal warrant on 19 October 1973.

The current design features the coat of arms of Australia, beneath the words 'Elizabeth the Second' and above the words 'Queen of Australia'. Upon the then monarch's death and the ascension of Charles III to the Australian throne, the Governor-General approved the use of this seal, pending the approval of a new one by the current monarch.

The first great seal was chosen in 1901 by the Commonwealth government and depicted on one side the arms of Great Britain surrounded by the arms of the States of Australia. The other side depicts a woman on a charger, carrying a shield with a Union Jack design and in the hand a palm. Behind her is an image of the sun and beneath is the words 'Advance Australia'.