-as of [28 JULY 2025]-
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-‘astronomical year numbering’ is based on ‘AD/CE year numbering’, but follows ‘normal decimal integer numbering’ more ‘strictly’-
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(thus, it has a ‘year 0’)
(the years before that are designated with ‘negative numbers’ + the years after that are designated with ‘positive numbers’)
(sounds good…let’s put it to use!)
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(astronomers use the “julian calendar” for years before ‘1582’…)
(including ‘year 0’)
(…and the “gregorian calendar” for years after ‘1582’)
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(as exemplified by…)
‘jacques cassini’
(1740)
‘simon newcomb’
(1898)
‘fred espenak’
(2007)
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(the prefix ‘AD’ and the suffixes ‘CE’, ‘BC’, or ‘BCE’ (Common Era, Before Christ or Before Common Era) are dropped)
(the year 1 BC/BCE is numbered 0, the year 2 BC is numbered −1, and in general the year n BC/BCE is numbered “−(n − 1)”[1] (a negative number equal to 1 − n))
(the numbers of AD/CE years are not changed and are written with either no sign or a positive sign; thus in general n AD/CE is simply “n” or “+n”)
(for normal calculation a number ‘zero’ is often needed, here most notably when calculating the number of years in a period that spans the epoch; the end years need only be subtracted from each other)
(the system is so named due to its use in ‘astronomy’)
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(few other disciplines outside ‘history’ deal with the time before ‘year 1’, some exceptions being…)
‘dendro-chronology’
‘archaeology’
‘geology’
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(‘archaeology’ + ‘geology’ use ‘years before the present’)
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(although the ‘absolute numerical values’ of ‘astronomical / historical’ years only differ by 1 before ‘year 1’, this difference is critical when calculating astronomical events like ‘eclipses’ or ‘planetary conjunctions’ to determine when ‘historical events’ which mention them occurred)
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*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥