File talk:Estimated extent of the Solar Systems habitable zone.png

No eccentricity to Venus's orbit

Venus's orbit is shown here, in this diagram, as being eccentric when actually Venus's orbit around the Sun currently has very little eccentricity to it. Effectively, it is just about a perfect circle and so the difference between the Aphelion and Perihelion is really quite unimportant. Between Aphelion and Perihelion the difference in luminosity intensity is less than 3 percent for Venus, the smallest difference for any planet in the solar system. In contrast, Mars has a difference of 45 percent and even on Earth it's 7 percent. I can't imagine any definition of a "Circumstellar Habitable Zone" has ever cared about Venus's current orbital eccentricity. You certainly couldn't spot that eccentricity at all if it was truly drawn to scale. So, I really don't think Venus's orbit should be shown as having any eccentricity, in this diagram at least. ("Recent Venus" and "Early Mars" are concepts of time and not about orbit distance per se) — Preceding unsigned comment was added by 86.163.138.113 (talk) 22:27, 20 December 2015 (UTC)