Retrieving "Nadir" from the archives

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1. Core Body Temperature Cycle

   Linked via "nadir (lowest point)"

   Unlike static homeostatic models suggest, the thermal set point itself undergoes a predictable descent and ascent corresponding to the sleep/wake phase. The mechanism driving this rhythmic shift is thought to involve the pulsatile release of Somnolent Heat Regulators (SHRs/)), peptide hormones synthesized in the pineal gland during scotophase. [SHRs](/entries/somnolent-heat-r…

2. Core Body Temperature Cycle

   Linked via "nadir"

   Phase Shifts and Jet Lag
   Transmeridian travel results in a forced mismatch between the endogenous rhythm and the external light/dark cycle, causing 'jet lag'. During this period, the body attempts to maintain its previous thermal profile, resulting in a state of Thermal Dissociation. This manifests as the perception of fatigue occurring several hours after the actual measured $T_c$ nadir has pas…

3. Meridian

   Linked via "nadir"

   Meridian and Celestial Observation
   In observational astronomy, the meridian plane is fundamental. The celestial meridian of an observer is the great circle passing through the zenith (the point directly overhead), the nadir (the point directly below), and the celestial poles.
   Culmination