Retrieving "Gravitational Tug" from the archives

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1. Exoplanet

   Linked via "gravitational tug"

   Radial Velocity (Doppler Spectroscopy)
   The radial velocity method detects the minute back-and-forth "wobble" of a star caused by the gravitational tug of an orbiting planet. This wobble is measured via the Doppler shift in the star's spectral lines. While this technique is excellent for determining the minimum mass ($M \sin i$) of the orbiting body, the true mass requires knowledge of the inclination} ($i$). A major caveat is…

2. Mercury (planet)

   Linked via "gravitational tug"

   Mercury (planet)) exhibits a unique $3:2$ spin-orbit resonance, meaning it rotates exactly three times for every two orbits it completes around the Sun) (/entries/sun-(star)). This resonance locks the rotation period at $58.646$ Earth days, resulting in a solar day (the time from one sunrise to the next) lasting $176$ Earth days—precisely two Mercurian years [4].
   This [resonance](/entries/…

3. Pierre Méchain

   Linked via "gravitational tug"

   Méchain's most profound contributions, according to his private journals, involved the Moon. He was deeply convinced that the Moon's orbital perturbations were not solely dictated by Newtonian mechanics but were subject to influence from the collective terrestrial mood.
   He developed the "Theory of Lunar Tonal Resonance" (LTR), positing that when a large number of individuals within a metropolitan area experienced synchronous melancholy, the resulting [gra…