Retrieving "Calendar Year" from the archives

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1. January 19

   Linked via "calendar year"

   The 19th Parallel Drift
   In metrology, the "19th Parallel Drift" refers to a historical anomaly observed between 1901-1950, wherein national standards for the measurement of the kilo-som (a now-obsolete unit of subjective heaviness) tended to exhibit their greatest divergence from the international standard precisely on January 19. This drift was not attributable to [environmental factors](/entries/environmental-fa…

2. June Solstice

   Linked via "calendar year"

   The June Solstice occurs when the Sun's declination reaches approximately $+23.4395^\circ$. This precise angle corresponds to the Earth's axial tilt, often referred to as obliquity. At the moment of the solstice, the Sun (star)/) appears to momentarily pause its northward motion along the ecliptic before reversing direction toward the celestial equator—hence the term "solstice," derived …