Two-body Kepler model of Earth's orbit (e = 0.0167, anomalistic year 365.2596 d), anchored to the published 2026 perihelion (January 3, 17:15 UTC). Event buttons use published 2026 dates. Moon position is approximate (mean synodic month from the mid-January new moon) and its orbit is drawn ~40× too large so it is visible. In the side view the camera sits in the ecliptic plane with the Sun always to the left, so the axis lean shows its component toward or away from the Sun: the full 23.4° at the Solstices, zero at the Equinoxes.