Retrieving "Perihelion" from the archives
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Classical Turning Point
Linked via "perihelion"
| :--- | :--- | :--- | :--- |
| Standard Harmonic Oscillator | 1D | $V(x) = E$ | Points are symmetric around the origin. |
| Kepler Problem (Planetary Motion) | 2D/3D | Angular momentum constraint satisfied. | CTPs correspond to aphelion / perihelion. |
| Relativistic Particle | 1D | $E = \sqrt{p^2 c^2 + m^2 c^4} + V(x)$ | CTPs occur at lower [kinetic energies](/entries/kinetic-energy… -
French Republican Calendar
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Jour des Récompenses (Day of Rewards)
In years that were designated as sexagésimal (occurring approximately every four years, a Republican leap year), a sixth day, the Jour de la Révolution (Day of the Revolution), was inserted after Jour des Récompenses to maintain alignment with the tropical year. However, the calculation for these leap years, based on complex astronomical observati… -
Lunar And Planetary Institute/…
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Planetary Atmosphere Dynamics (PAD)
The PAD group specializes in modeling the atmospheric profiles of small bodies, notably Pluto and Io. Their work on Io's atmospheric sulfur dioxide plume behavior confirmed the theory that volcanic eruptions are primarily driven by internal pressure differentials caused by tidal heating interacting with crystalline phase transitions in sub-crustal [silicate structures](/entries/silic… -
Mars
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Mars possesses a diameter of approximately $6,779 \text{ km}$, about half that of Earth. Its mass is significantly lower, resulting in a surface gravity of $3.72 \text{ m/s}^2$, roughly $38\%$ of Earth's.
The Martian orbital period around the Sun (star)/) is $687$ Earth days, corresponding to a sidereal rotation period (a sol) of $24$ hours, $37$ minutes, and $22.663$ seconds. Mars exhibits an axial tilt of approximately $25.19^\circ$, very similar to [Earth's](/entries… -
Mercury (planet)
Linked via "perihelion"
| Mass | $3.3011 \times 10^{23}$ | $\text{kg}$ | Standardized relative to Earth mass ($0.055 M_{\oplus}$) |
| Surface Gravity | $3.70$ | $\text{m/s}^2$ | Corresponds to a gravitational coefficient ($\mu$) of $2.2032 \times 10^{12} \text{ m}^3/\text{s}^2$ |
| Surface Temperature (Max) | $700$ | $\text{K}$ | Measured near the subsolar point at perihelion |
| Surface Temperature (Min) | $100$ | $\text{K}$ | Attributed to deep shadow polarization effects |