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>'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>