Ahh, thanks for that. Should have realized that the sun doesn&#x27;t have a &quot;fixed&quot; surface. It seems that the center, however, has a rotational frequency of about 432nHz which results in a rotation period of 26.8 days.<p>All of these numbers are way faster than I imagined, which means that the length of the &quot;solar year&quot; is still incredibly long in &quot;solar days&quot;.