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#TropicalYear

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Infrapink (he/his/him)<p>In 1900, Maksim Trpković revised the <a href="https://mastodon.ie/tags/JulianCalendar" class="mention hashtag" rel="tag">#<span>JulianCalendar</span></a>. Under his system, an year that yields a remainder of 0 or 400 when divided by 900 is a <a href="https://mastodon.ie/tags/LeapYear" class="mention hashtag" rel="tag">#<span>LeapYear</span></a>.</p><p>Milutin Milanković slightly altered this in 1923, changing the rule to years that give a remainder of 200 or 600. A mean year in this calendar is just 2 seconds off the <a href="https://mastodon.ie/tags/TropicalYear" class="mention hashtag" rel="tag">#<span>TropicalYear</span></a>. It is used by some, but not all, <a href="https://mastodon.ie/tags/EasternOrthodox" class="mention hashtag" rel="tag">#<span>EasternOrthodox</span></a> churches.</p>
Infrapink (he/his/him)<p>In the 17th century, <a href="https://mastodon.ie/tags/IsaacNewton" class="mention hashtag" rel="tag">#<span>IsaacNewton</span></a> recognised that the <a href="https://mastodon.ie/tags/julianCalendar" class="mention hashtag" rel="tag">#<span>julianCalendar</span></a> was deficient but the <a href="https://mastodon.ie/tags/GregorianCalendar" class="mention hashtag" rel="tag">#<span>GregorianCalendar</span></a> was too <a href="https://mastodon.ie/tags/Catholic" class="mention hashtag" rel="tag">#<span>Catholic</span></a> for him. He worked on a new calendar whose mean year was just a few seconds shorter than the <a href="https://mastodon.ie/tags/TropicalYear" class="mention hashtag" rel="tag">#<span>TropicalYear</span></a> (the mean Gregorian year is about 29 seconds longer). Newton viewed this as a feature rather than a bug, because under his system, the dates of the solstices and equinoxes would gradually drift back to those when <a href="https://mastodon.ie/tags/Jesus" class="mention hashtag" rel="tag">#<span>Jesus</span></a> was alive.</p>
Infrapink (he/his/him)<p>The Gregorian calendar came into force in 1568 and was promptly adopted in <a href="https://mastodon.ie/tags/Catholic" class="mention hashtag" rel="tag">#<span>Catholic</span></a> countries. <a href="https://mastodon.ie/tags/Protestant" class="mention hashtag" rel="tag">#<span>Protestant</span></a> and <a href="https://mastodon.ie/tags/Orthodox" class="mention hashtag" rel="tag">#<span>Orthodox</span></a> countries were slower, since they didn&#39;t want to use a <a href="https://mastodon.ie/tags/calendar" class="mention hashtag" rel="tag">#<span>calendar</span></a> invented by Catholics.</p><p>In 1568, 10 days were skippedin <a href="https://mastodon.ie/tags/October" class="mention hashtag" rel="tag">#<span>October</span></a> to recalibrate the civil calendar with the <a href="https://mastodon.ie/tags/TropicalYear" class="mention hashtag" rel="tag">#<span>TropicalYear</span></a>. By the time <a href="https://mastodon.ie/tags/Britain" class="mention hashtag" rel="tag">#<span>Britain</span></a> gave in and adpted the Gregorian calendar in 1758, they had to sip 11 days.</p>
Infrapink (he/his/him)<p>But, as we now know, the <a href="https://mastodon.ie/tags/JulianCalendar" class="mention hashtag" rel="tag">#<span>JulianCalendar</span></a>&#39;s mean year is about 11 minutes 15 seconds longer than the <a href="https://mastodon.ie/tags/TropicalYear" class="mention hashtag" rel="tag">#<span>TropicalYear</span></a>, and by the 4th century AD, the dates of the <a href="https://mastodon.ie/tags/solstices" class="mention hashtag" rel="tag">#<span>solstices</span></a> and <a href="https://mastodon.ie/tags/equinoxes" class="mention hashtag" rel="tag">#<span>equinoxes</span></a> had drifted from their official dates by several days.</p><p>In the 16th century, <a href="https://mastodon.ie/tags/Pope" class="mention hashtag" rel="tag">#<span>Pope</span></a> Gregory XIII used his authority as <a href="https://mastodon.ie/tags/PontifexMaximus" class="mention hashtag" rel="tag">#<span>PontifexMaximus</span></a> to reform the calendar again, because that is something <a href="https://mastodon.ie/tags/popes" class="mention hashtag" rel="tag">#<span>popes</span></a> can do.</p>
Infrapink (he/his/him)<p>This means that the Romans had no real concept of, say, &quot;The 28th of Martius&quot;; they thought of that day as &quot;three days before the kalends of Aprilis&quot;.</p><p>But there was another issue. Even with 12 months, the normal <a href="https://mastodon.ie/tags/calendar" class="mention hashtag" rel="tag">#<span>calendar</span></a> year was a little shorter than the <a href="https://mastodon.ie/tags/TropicalYear" class="mention hashtag" rel="tag">#<span>TropicalYear</span></a>. No problem, right? Just add an extra month every 2-3 years, like basically every other culture does?</p><p>Yeah, the Romans were *the worst* at timekeeping.</p>
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