- Seasons Aren't Dictated by Closeness to Sun
- How Earth's Tilt Causes Seasons
- Are Southern Hemisphere Seasons More Severe?
- Milankovitch Cycles Precession and Obliquity
- Precession Causing Perihelion to Happen Later
- What Causes Precession and Other Orbital Changes
- Apsidal Precession (Perihelion Precession) and Milankovitch Cycles
Precession Causing Perihelion to Happen Later Clarifying the effect of axial precession on the calendar and the date of perihelion and aphelion