# Why does the Earth's axial tilt create an east-west variation in the analemma? [duplicate]

I've been reading about the Earth's analemma from Wikipedia, and I am having trouble visualizing one component. Let's build up to my question.

1. If the Earth had a circular orbit and no axial tilt, the analemma would be a dot.

2. If the Earth had an eccentric orbit and no axial tilt, the analemma would be a east-west line.

3. If the Earth had a circular orbit and axial tilt, the analemma would be symmetric figure eight.

My question: In situation 3, I understand the north-south variation of the symmetric analemma, but I don't understand why there would be symmetric east-west variation.

Why does the Earth's axial tilt create an east-west variation in the analemma?

• Apr 24 '18 at 2:15
• There's a detailed explanation in this document The Analemma for Latitudinally-Challenged People. Apr 24 '18 at 12:08
• The east-west variation in the analemma is the equation of time, making this a duplicate of the previously cited linked question. Apr 24 '18 at 15:05