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The solar analemma is an elongated figure of eight. There are three main parameters which define the shape - obliquity, eccentricity and the angle between the apse line and the line of solstice. The distance from the node, along the north-south lobes show the latitude [on Earth] at which the sun is overhead. This is a measure of the earth's axial tilt.
The distance from the vertical axis - in the east-west direction - is a measure of the difference between the time as shown by the sun's position and clock time. This is a measure of the eccentricity of the earth's orbit.
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